Search our library of Maths questions

Top answers

Maths

All levels

Ian earns £420 a week after a 5% rise. What was his pay before?

Ian had a 5% rise, so £420 = 105% of his original pay

To find 1% of his original earnings, divide £420 by 105.

Multiply this by 100 to find his old pay:
1% of his original earnings =...

Answered by Haris S. • Maths tutor

7343 Views

Solve for x, 5sin(x) - 3cos(x) = 2 , in the interval 0<x<2pi

5sin(x)-3cos(x)=2

Express in the form Rsin(x-@) = Rsin(x)cos@ - Rcos(x)sin@

Rcos@ =5

Rsin@ = 3

tan@ = 3/5 @=tan^-1(3/5)= 0.540

R = sqrt(5^{2 <...}

Answered by Stefan M. • Maths tutor

4503 Views

Use implicit differentiation to find dy/dx of: 2(x^2)y + 2x + 4y - cos((pi)y) = 17

Tackle this problem one part at a time: First differentiate 2x²y using the product rule, showing dy/dx(2x²y) = 4xy + 2x²(dy/dx). After this, the remainder of the question ...

Answered by Nick E. • Maths tutor

5669 Views

Solve x^2+2x-4, leaving your answer in the simplist surd form. (4marks)

Simplist surd form means use Quadratic equation

Write out Quadratic equation

Write out value of a, b and c

Fit these values into equation
DR
Answered by Desnie R. • Maths tutor
3185 Views

Why is n^0 always 1 and not 0?

Anything raised to the zeroth power is a difficult thing to get your head around. The easiest explanation (not a full proof) is to look at what happens as we go down in powers of n: n^3=nnn ...

Answered by Joseph C. • Maths tutor

4348 Views