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Maths
GCSE

How do you work out the surface area of a cylinder?

Okay so to work out the surface area of any 3D shape, you should look at the area of every surface on the shape individually. I would then draw a cylinder. First, we can work out the area of this...

ON
Answered by Ollie N. Maths tutor
3432 Views

Simplify fully {x^2 -3x -4}/{x^2 + 4x +3}

  1. Factorise the top and bottom {x^2 -3x -4}/{x^2 + 4x +3}=(x+1)(x-4)/(x+1)(x+3)                                                                                                  2) Cancel the common te...
JT
Answered by James T. Maths tutor
3463 Views

An amount of money was invested for 8 years. It earned compound interest at 2.5% per year. After 8 years the total value of the investment was £11,696.67. Work out the total interest earned.

I would make sure the student new the difference between simple and compound interest to begin with. I would then explain the formula for compound interest and how it works normally. The formula is p(1+m)...

LJ
Answered by Laura J. Maths tutor
8583 Views

How to factorise the expression x^2 + 8x + 15

We need to get the quadratic expression into the form (x + a)(x + b). If we expand this expression using FOIL, we see that the resulting expression is x2 + (a+b)x + ab. We can now find a and b ...

CS
Answered by Charlotte S. Maths tutor
3414 Views

How do I calculate negative powers?

The power of a number indicates how many times that number must be multiplied by itself. If the power is a negative, this means that the number (or the base) is a fraction, with the base as a denominator....

MN
Answered by Molly N. Maths tutor
9895 Views

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