Search our library of Maths questions

Top answers

Maths

All levels

The time, T seconds, it takes a water heater to boil a constant mass of water is inversely proportional to the power, P watts, of the water heater. When P is 300, T is 20. What is T when P is 400?

This is a question regarding inverse proportion. This is when one value increases as the other decreases.

For this question, the equation can be written as:

T ∝ 1/P

The directly propo...

Answered by Scott A. • Maths tutor

10892 Views

What is the factor theorem?

The factor theorem helps us to find factors of polynomial equations, by substituting in number values for x to see whether the equation equals zero. For any polynomial P(x), the factor theorem would state...

Answered by Alex T. • Maths tutor

8515 Views

Find the area of a sector with a radius of 5cm and an angle of 120 degrees?

pi r r

pi 5x5

25pi = 360 degrees

120/360 x 25pi = 25/3 pi

Teaching Points:

Area of a circle + other formalue for circumfrence

Degrees of a circle

Fracti...

Answered by Anish P. • Maths tutor

4394 Views

How do you measure the gradient of a straight line joining two points?

There is a simple method for working out the gradient of a straight line joining any two points, for which the X and Y coordinates are known. For instance, if our first point is: A(X₁,Y₁

Answered by Alex T. • Maths tutor

10379 Views

Why maths is so hard sometimes?

I have been struggling with maths when my teacher failed to teach me how to understand maths and only made me do the homework and tests. Maths is all about understanding the logic behind the calculations,...

Answered by Anna N. • Maths tutor

3231 Views