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A class of 10 students all complete a maths exam. Their marks are as follows: 67, 82, 48, 36, 55, 95, 19, 49, 62 and 73. Find the mean, median and range.

First let's start with the mean, the formula for the mean is: (Sum of terms)/(amount of terms). We know the amount of terms is 10 as this is in the questions, to find the sum of the terms we add all the mark...
GA
Answered by George A. • Maths tutor
3345 Views

Solve the equation: x^2+7x=-12

The first step for this question is to rearrange the equation to get the right hand side equal to 0.x^2+7x+12=0Next, we have to try and factorise this equation. We do this by considering what two numbers mul...
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Answered by George A. • Maths tutor
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Briefly describe Domino theory and how it affected US foreign policy.

Domino theory was an idea in the US, popularised during Eisenhower's time in office, that stated that if a country fell to communist forces, then other countries around it would also fall in succession, as a...
HM
Answered by Huw M. • History tutor
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Assuming no friction, describe the motion of a simple pendulum released from rest at t=0 at amplitude A? Provide information about its speed and position at characteristic times during one period. [The 1D equation of motion is described by a cosine]

The displacement of the bob of mass m is given by the equation x(t)=A cos(w*t), with no phase offset as given by the boundary conditions (zero speed at t=0). By differentiating this equation twice the first ...
SA
Answered by Stefan A. • Physics tutor
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Explain the difference in reactivity of the halogens as group 7 is descended.

The halogens become less reactive as the group is descended. The halogens react by accepting an electron into its outer shell from another atom. As the halogens are descended, the outer electron shell become...
TA
Answered by Tomos A. • Chemistry tutor
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