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If an equation of a line is y=2x+4 and it crosses the x axis at point R, what is the value of x?

Since we know that the line crosses the x axis, we can assume that the value of Y at this point is 0. So we must substitute y = 0 into the equation y = 2x + 40 = 2x + 4we now have to isolate x on its own so ...
AC
Answered by Abigail C. • Maths tutor
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Make A the subject of the following formula: S = UT + 1/2AT^2

The important thing to remember when rearranging equations is whatever you do to one side must be balanced with the other.1) So in this case, the first thing we want to do is to leave the term with A in it (...
TC
Answered by Thomas C. • Maths tutor
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A cylinder has dimensions: diameter = 4x+2 and height = 4. Work out the volume of this cylinder. Give your answer in terms of x

The volume of a cylinder = (pi).r 2 .hAs the diameter is given in the question, we need to halve it to get the radius --> r = (4x+2)/2 = 2x+1This means the volume of the cylinder = (pi).(2x+1) 2 .4 First ...
BG
Answered by Ben G. • Maths tutor
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How do I rationalise the denominator of √2+1]/√2-1?

We must choose something to multiply the numerator and denominator of the fraction by the same thing, and the best thing to choose is the difference of two squares (since (x^2-y)(x^2+y)=x^2-y^2 ). So we do (...
HJ
Answered by Harry J. • Maths tutor
6245 Views

A cuboid has dimensions: width = x+1, length = 2x-2, height = x+2. Work out the volume of this cuboid. Give your answer in terms of x.

Volume of cuboid = width x length x heightV = (x + 1)(2x - 2)(x + 2) For simplicity, multiply the first 2 sets of brackets first. Then multiply the result by the third set of brackets.Note: for multiplicatio...
SA
Answered by Sam A. • Maths tutor
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