Search our library of Maths questions

Top answers

Maths

All levels

a). Solve x-4=13, b). solve 7y=35 c). solve 3w-9=27

a). x-4=13

13+4=17

x=17

b). 7y=35

35/7=5

y=5

c). 3w-9=27

3w=27+9

3w=36

w=36/3

w=12

Answered by Joe M. • Maths tutor

2845 Views

Express 2Cos(a) - Sin(a) in the form RCos(a+b) Give the exact value of R and the value of b in degrees to 2 d.p.

R = 5^0.5

b = 26.57 degrees

Answered by William F. • Maths tutor

4140 Views

How to find the reciprocal of a graph, such as y=cos(x)?

To find the reciprocal of any graph, first consider the key points, in this case: (0,1), (90,0), (180,-1), (270,0) and (360,1). Since we are finding the reciprocal in the y-axis, we can find the reciproca...

Answered by Aqeel A. • Maths tutor

4398 Views

log8(5) = b. Express log4(10) in terms of b

log₈5=b

using the base change rule

log₈5=log₄5/log₄8

log₄8 can be solved:...

Answered by Beatrice M. • Maths tutor

9810 Views

Let f(x) = x * sin(2x). Find the area beneath the graph of y = f(x), bounded by the x-axis, the y-axis and the line x = π/2.

After short consideration, we see that we must integrate f(x) with respect to x, between 0 and π/2, using integration by parts. Taking the formula for integration by parts, we set u = x and dv/dx = sin(2x...

Answered by Benjamin C. • Maths tutor

4303 Views