# Recent questions tagged o-level

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What is the probability that of 25 randomly selected students, no two share the same birthday?
What is the probability that of 25 randomly selected students, no two share the same birthday?What is the probability that of 25 randomly selected students, no two share the same birthday? ...
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Did climate change cause the dust bowl?
Did climate change cause the dust bowl?Did climate change cause the dust bowl? ...
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$A, B, C$ and $D$ are points on the circumference of a circle such that $A B=B C$. $A F$ is a tangent to the circle through $A B C D$ at $A$.
$A, B, C$ and $D$ are points on the circumference of a circle such that $A B=B C$. $A F$ is a tangent to the circle through $A B C D$ at $A$. $A, B, C$ and $D$ are points on the circumference of a circle such that $A B=B C$. $A F$ is a tangent to the circle through $A B C D$ at \ ...
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What is $12\dfrac{1}{3}$ percent as a fraction?
What is $12\dfrac{1}{3}$ percent as a fraction?What is $12\dfrac{1}{3}$ percent as a fraction? ...
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A cup of coffee, cooling off in a room at temperature $20^{\circ} \mathrm{C}$, has cooling constant $k=0.09 \mathrm{~min}^{-1} .$
A cup of coffee, cooling off in a room at temperature $20^{\circ} \mathrm{C}$, has cooling constant $k=0.09 \mathrm{~min}^{-1} .$(a) How fast is the coffee cooling (in degrees per minute) when its temperature is $T=80^{\circ} \mathrm{C} ?$ (b) Use linear approximation to estim ...
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Ignoring air resistance, give an expression for the time it takes for a ball to drop $H$ meters (from rest) under a constant gravitational acceleration $g$.
Ignoring air resistance, give an expression for the time it takes for a ball to drop $H$ meters (from rest) under a constant gravitational acceleration $g$.In 1939 , Joe Sprinz, a professional baseball player, attempted to catch a ball dropped from a blimp. This was done for the purpose of braking the rec ...
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A particle starts from rest (that is with initial velocity zero) at the point $x=10$ and moves along the $x$-axis with acceleration function $a(t)=12 t$. Find the resulting position function $x(t)$.A particle starts from rest (that is with initial velocity zero) at the point $x=10$ and moves along the $x$-axis with acceleration function $a(t ... close Notice: Undefined index: avatar in /home/customer/www/mathsgee.com/public_html/qa-theme/AVEN/qa-theme.php on line 993 The equation of position vs. time for a moving object, in SI units, is as \(x=-t^{2}+6 t-9 .$ Which of the following choices are correct?
The equation of position vs. time for a moving object, in SI units, is as $x=-t^{2}+6 t-9 .$ Which of the following choices are correct?The equation of position vs. time for a moving object, in SI units, is as $x=-t^{2}+6 t-9 .$ Which of the following choices are correct? (a) The ob ...
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Factorise $10 x y^2+52 x y$
Factorise $10 x y^2+52 x y$Factorise $10 x y^2+52 x y$ ...
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Simplify $\frac{1}{7} \times \frac{9}{16} \times \frac{16}{9} \times \frac{16}{9} \times \frac{9}{16}=$
Simplify $\frac{1}{7} \times \frac{9}{16} \times \frac{16}{9} \times \frac{16}{9} \times \frac{9}{16}=$Simplify $\frac{1}{7} \times \frac{9}{16} \times \frac{16}{9} \times \frac{16}{9} \times \frac{9}{16}=$ ...
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What is a line graph?
What is a line graph?What is a line graph? ...
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Make $S$ the subject of the relation $\mathrm{p}=\mathrm{s}+\frac{\mathrm{sm}^{2}}{\mathrm{nr}}$
Make $S$ the subject of the relation $\mathrm{p}=\mathrm{s}+\frac{\mathrm{sm}^{2}}{\mathrm{nr}}$Make $S$ the subject of the relation \ \mathrm{p}=\mathrm{s}+\frac{\mathrm{sm}^{2}}{\mathrm{nr}} \ ...
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Factorise completely: $75 x-12 x^{3}$
Factorise completely: $75 x-12 x^{3}$Factorise completely: $75 x-12 x^{3}$ ...
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Factorise completely: $x-16 x^{3}$
Factorise completely: $x-16 x^{3}$Factorise completely: $x-16 x^{3}$ ...
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A map is drawn to a scale of 1:75000. This scale can be expressed as $1cm$ respresents $n \mathrm{~km}$. Find $n$.
A map is drawn to a scale of 1:75000. This scale can be expressed as $1cm$ respresents $n \mathrm{~km}$. Find $n$.A map is drawn to a scale of 1:75000. This scale can be expressed as $1cm$ respresents $n \mathrm{~km}$. Find $n$. ...
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A learner did a project on climate change At 14: 00 each day, she record ed the temperature (in $\left.{ }^{\circ} \mathrm{C}\right)$ for a certain town. The information is given in the frequency table below. A learner did a project on climate change At 14: 00 each day, she record ed the temperature (in $\left.{ }^{\circ} \mathrm{C}\right)$ for a certai ...
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Express 80 as a product of primes.
Express 80 as a product of primes.Express 80 as a product of primes. ...
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Show that $\overrightarrow{P Q}$ is perpendicular to $\overrightarrow{R S}$
Show that $\overrightarrow{P Q}$ is perpendicular to $\overrightarrow{R S}$(a) Given that $m=(6 i+8 j)$ and $n=\left(-8 i+\frac{7}{3} j\right)$, find the : (i) magnitudes and direction of $\mathrm{m}$ and \(\mathrm{n} ; ...
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What number did she think of?
What number did she think of?Boguslawa thinks of a number. She trebles the number. She then subtracts 8 . Boguslawa's answer is 16 . What number did she think of? ...
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Suppose the position of an object at time $t$ is given by $f(t)=-49 t^{2} / 10+5 t+10 .$ Find a function giving the speed of the object at time $t .$
Suppose the position of an object at time $t$ is given by $f(t)=-49 t^{2} / 10+5 t+10 .$ Find a function giving the speed of the object at time $t .$Suppose the position of an object at time $t$ is given by $f(t)=-49 t^{2} / 10+5 t+10 .$ Find a function giving the speed of the object at time $t .$ ...
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What is a linear equation?
What is a linear equation?What is a linear equation? ...
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Solve the linear equation: $3(x+2)-2(1-x)=4 x+5$
Solve the linear equation: $3(x+2)-2(1-x)=4 x+5$Solve the linear equation: $3(x+2)-2(1-x)=4 x+5$ ...
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Solve the linear equation: $-x-7=-3 x-9$
Solve the linear equation: $-x-7=-3 x-9$Solve the linear equation: $-x-7=-3 x-9$ ...
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Express $b \times b \times b \times b \times b$ in exponential form:
Express $b \times b \times b \times b \times b$ in exponential form:Express $b \times b \times b \times b \times b$ in exponential form: ...
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$\dfrac{2^{2016}+2^{2017}+2^{2018}+2^{2019}}{2^{2017}+2^{2018}+2^{2019}+2^{2020}}$ is equal to
$\dfrac{2^{2016}+2^{2017}+2^{2018}+2^{2019}}{2^{2017}+2^{2018}+2^{2019}+2^{2020}}$ is equal to$\dfrac{2^{2016}+2^{2017}+2^{2018}+2^{2019}}{2^{2017}+2^{2018}+2^{2019}+2^{2020}}$ is equal to ...
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$1+\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{4}}}$ is equal to
$1+\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{4}}}$ is equal to$1+\dfrac{1}{2+\dfrac{1}{3+\dfrac{1}{4}}}$ is equal to ...
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If a taxpayer paid $\$ 28,925.35$in federal tax, what was her gross annual income for 2011? 0 answers 82 views If a taxpayer paid$\$28,925.35$ in federal tax, what was her gross annual income for 2011?In 2011 , Canadian federal tax rates were $0 \%$ on the first $\$ 10,527$of gross income earned,$15 \%$on the next$\$31,017,22 \%$ on the next $\ ... close Notice: Undefined index: avatar in /home/customer/www/mathsgee.com/public_html/qa-theme/AVEN/qa-theme.php on line 993 Solve the linear equation$\frac{3 m}{4}+2 m=4 m-15$1 answer 126 views Solve the linear equation$\frac{3 m}{4}+2 m=4 m-15$Solve the linear equation &nbsp;$\frac{3 m}{4}+2 m=4 m-15$... close Notice: Undefined index: avatar in /home/customer/www/mathsgee.com/public_html/qa-theme/AVEN/qa-theme.php on line 993 Solve for$x$:$9^{x+1}=27^{x}$1 answer 112 views Solve for$x$:$9^{x+1}=27^{x}$Solve for$x$:$9^{x+1}=27^{x}$... close Notice: Undefined index: avatar in /home/customer/www/mathsgee.com/public_html/qa-theme/AVEN/qa-theme.php on line 993 Express$9^{x-1}+3^{2 x}$as a single power expression. 1 answer 116 views Express$9^{x-1}+3^{2 x}$as a single power expression.Express$9^{x-1}+3^{2 x}$as a single power expression. ... close Notice: Undefined index: avatar in /home/customer/www/mathsgee.com/public_html/qa-theme/AVEN/qa-theme.php on line 993 The Indiana State Police wish to estimate the average mph being traveled on the Interstate Highways, which cross the state. 1 answer 85 views The Indiana State Police wish to estimate the average mph being traveled on the Interstate Highways, which cross the state.The Indiana State Police wish to estimate the average mph being traveled on the Interstate Highways, which cross the state. If the estimate is to be w ... close 0 answers 709 views Alizon is making pancakes with the same recipe requiring$\frac{3}{4}$cups of flour. She wants to make half a recipe. She estimates that a$\frac{1}{2}$cup of flour is needed. Is that an underestimate or an overestimate?Alizon is making pancakes with the same recipe requiring$\frac{3}{4}$cups of flour. She wants to make half a recipe. She estimates that a$\frac{1}{ ...
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Kaymin and Shaquiel are making pancakes. One full recipe requires $\frac{3}{4}$ cups of flour. They wish to double the recipe. How  many cups of flour do they need?
Kaymin and Shaquiel are making pancakes. One full recipe requires $\frac{3}{4}$ cups of flour. They wish to double the recipe. How  many cups of flour do they need?Kaymin and Shaquiel are making pancakes. One full recipe requires $\frac{3}{4}$ cups of flour. They wish to double the recipe. How &nbsp;many cups of ...
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Solve the quadratic equation $3 x^{2}+2 x-8=0$
Solve the quadratic equation $3 x^{2}+2 x-8=0$Solve the quadratic equation $3 x^{2}+2 x-8=0$ ...
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A rally driver in a competition is expected to cover a distance of 285 km in five hours. Part of the race track is murram while the rest is under repair.
A rally driver in a competition is expected to cover a distance of 285 km in five hours. Part of the race track is murram while the rest is under repair.A rally driver in a competition is expected to cover a distance of 285 km in five hours. Part of the race track is murram while the rest is under repa ...
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Evaluate $p-q$ for the given values. $p=2, q=20$
Evaluate $p-q$ for the given values. $p=2, q=20$Evaluate $p-q$ for the given values. $p=2, q=20$ ...
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Sharon weeded $5 / 6$ of her yard in the morning and $1 / 6$ of the yard in the afternoon. What part of the yard did she weed altogether?
Sharon weeded $5 / 6$ of her yard in the morning and $1 / 6$ of the yard in the afternoon. What part of the yard did she weed altogether?Sharon weeded $5 / 6$ of her yard in the morning and $1 / 6$ of the yard in the afternoon. What part of the yard did she weed altogether? ...
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Solve for $k$ in $\sqrt{8 k}=k$
Solve for $k$ in $\sqrt{8 k}=k$Solve for $k$ in $\sqrt{8 k}=k$ ...
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Solve simultaneously for the variables
Solve simultaneously for the variablesSolve simultaneously for the variables: $$2 a+3 b-4=0$$ $$b=\frac{1}{2} a^{2}+\frac{1}{2} a-3$$ ...
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If the displacement of a particle is zero, then what can we say about its distance covered?
If the displacement of a particle is zero, then what can we say about its distance covered?If the displacement of a particle is zero, then what can we say about its distance covered? ...
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What is the angle between instantaneous displacement and acceleration during the retarded motion
What is the angle between instantaneous displacement and acceleration during the retarded motionWhat is the angle between instantaneous displacement and acceleration during the retarded motion ...
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A particle moves along a straight line path. After sometime it comes to rest. The motion is with an acceleration whose direction with respect to the direction of velocity is
A particle moves along a straight line path. After sometime it comes to rest. The motion is with an acceleration whose direction with respect to the direction of velocity isA particle moves along a straight line path. After sometime it comes to rest. The motion is with an acceleration whose direction with respect to the d ...
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A particle moves with uniform velocity. Which of the following statements about the motion of the particle is true.
A particle moves with uniform velocity. Which of the following statements about the motion of the particle is true.A particle moves with uniform velocity. Which of the following statements about the motion of the particle is true. (a) its speed is zero. (b) its ac ...
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The time elapsed is plotted along $\mathrm{X}$ -axis and the acceleration is plotted along the Y-axis. The area between the graph and the X-axis gives...........
The time elapsed is plotted along $\mathrm{X}$ -axis and the acceleration is plotted along the Y-axis. The area between the graph and the X-axis gives...........The time elapsed is plotted along $\mathrm{X}$ -axis and the acceleration is plotted along the Y-axis. The area between the graph and the X-axis gives ...
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A particle moving with uniform speed can possess:
A particle moving with uniform speed can possess:A particle moving with uniform speed can possess: (a) radial acceleration (b) tangential acceleration (c) both radial and tangential accelerations (d ...
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The slope of the velocity time graph for retarded motion is:
The slope of the velocity time graph for retarded motion is:The slope of the velocity time graph for retarded motion is: (a) Positive (b) negative (c) zero (d) can be +ve, -ve or zero ...
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Which of the following can be zero when the particle is in motion for some time?
Which of the following can be zero when the particle is in motion for some time?Which of the following can be zero when the particle is in motion for some time? (a) Displacement (b) Distance covered (c) speed (d) none of the abov ...
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Which of the following statement is false for motion with uniform velocity
A car accelerates from rest for time $t_{1}$ at constant rate $a_{1}$ and then it retards at the constant rate $a_{2}$ for time $t_{2}$ and comes to rest. $\dfrac{t_{1} }{ t_{2}}=$A car accelerates from rest for time $t_{1}$ at constant rate $a_{1}$ and then it retards at the constant rate $a_{2}$ for time $t_{2}$ and comes to r ...