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Lewis wins £360 in a prize draw. He gives 15% to charity and puts 3/8 into his savings. The rest he uses to buy a bike. How much of the money has Lewis got left for this bike? Note: do not use a calculator

10% of £360 is £36. Therefore 5% of £360 would be £18 (half of the 10% figure). Added together, 15% of £360 would be £54. 1/8 of £360 is £45 (half £360 three times), therefore 3/8 would be £135 (£45*3). £54 ...
LB
Answered by Lewis B. • Maths tutor
3725 Views

how do I differentiate?

look at the power of term and multiply the coefficient of that term by the value of the power, then reduce the value of the terms power by 1. for example after differentiation 5X 4 becomes 20X 3 .
SL
Answered by Stefen L. • Maths tutor
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y = (x^2)sin(3x). Find dy/dx

We need to differentiate x 2 sin(3x). We know how to differentiate (x 2 ) on its own, and how to differentiate sin(3x) on its own. So we can use the Product rule: dy/dx = (d/dx(x 2 ))sin(3x) + x 2 (d/dx(sin(...
RD
Answered by Robert D. • Maths tutor
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differentiate x^2 + y^3 + xy respect to x

2x + 3y 2 * dy/dx + x * dy/dx +y
XJ
Answered by Xianming J. • Maths tutor
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dx/dt=-5x/2 t>=0 when x=60 t=0

dx/dt=-5x/2 Int(x, dx)=Int(-5/2, dt) ln(x)=-5t/2+c x=60 when t=0 ln(60)=c ln(x)=ln(60)-5t/2 x=e ln(60)-5t/2 x=60/e 5t/2
FD
Answered by Felix D. • Maths tutor
5259 Views