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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 proportional sign (∝) can be ...
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Answered by Scott A. • Maths tutor
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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 th...
AT
Answered by Alex T. • Maths tutor
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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 Fractions Dealing with Pi Terminology of sector + cord + tang...
AP
Answered by Anish P. • Maths tutor
5484 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(X 1 ,Y 1 ), and our second...
AT
Answered by Alex T. • Maths tutor
12800 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, th...
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Answered by Anna N. • Maths tutor
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