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What is compound interest?

Interest is the return you get on savings or an investment. Normal interest is when you earn a fixed percentage amount per year on an initial amount. For example an interest rate of 5% on £100 would give you...
YA
Answered by Yasmin A. • Maths tutor
3378 Views

You are given a right triangle ABC with angle ABC = 30 degrees and AB equal 7. Then AC and BC are then extended to points D and E so that EDC is a right triangle. Find length DE if BD = 15

First BC needs to be found. That is done by dividing AB by cosin ABC. Then CD is found by subtracting form BD. After that the angle ACB is 90-ABC (because ABC is right triangle). Then because AE and BD inter...
AE
Answered by Andrey E. • Maths tutor
5440 Views

3x+2y=12 ; 5x+3y=19

3x+2y=12 (1) /// 5x+3y=19 (2) /// . (1) x 3---(2) x -2 /// 9x+6y=36///-10x-6y=-38///x+0=-2/// x=2///y=5(2)+3y=19///y=9/3 = 3-///////--> x=2y=3first, we need to make one of the two terms (x or y) of the sa...
MR
Answered by Muzaina R. • Maths tutor
4883 Views

solve this equation x^2 -2x=-1

to first think about solving this equation you need to add 1 to both sides producing the equation x^2-2x+1=0 you then need to factorise this equation as it is a quadratic equation (x-1)(x-1) =0 for this to e...
GB
Answered by George B. • Maths tutor
5437 Views

Solve t^2-t=3(7+t)

Expand RHS: t 2 - t = 21+ 3tCollect all terms on one side: t 2 - 4t - 21 = 0Factorise and solve by inspection / use the quadratic formula to solve for t: (t + 3)(t - 7) = 0 / t = [ -(-4) ± ( (-4) 2 - 4x(1)x(...
CW
Answered by Charlie W. • Maths tutor
3673 Views