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Find the intercept between the two equations below?

y = 2x+5 y=x+1 First equate: 2x+5=x+1 Rearrage for x: 2x-x=1-5 Which gives: x=-4
HS
Answered by Harry S. • Maths tutor
3400 Views

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 circle ( I ...
ON
Answered by Ollie N. • Maths tutor
4451 Views

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

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 terms Answer = (x-4)/(x+3)
JT
Answered by James T. • Maths tutor
4301 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)^n ...
LJ
Answered by Laura J. • Maths tutor
10007 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 x 2 + (a+b)x + ab. We can now find a and b by comparing ...
CS
Answered by Charlotte S. • Maths tutor
4770 Views