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Mark buys a computer. A VAT of 10% is added to the price of the computer. He pays £246. What was the original price of the computer before VAT was added?

We want to find the original price of the computer.We know when 10% of the price was added to the computer it costs £264.So £264 is equal to the original price plus 10% of the original price.To find 10% o...

Answered by Lisa S. • Maths tutor

4146 Views

Express 56 as the product of its prime factors

2×2×2×7 - for complete method to find prime factors; could be shown on a complete factor tree.

Answered by Nanditha S. • Maths tutor

2887 Views

Work out the value of 81^(-1/4) (Non-Calculator)

To answer this question, we have to think about our power rules and use them to slowly simplify this complicated expression:81^-1/4 = ((81)^1/2)^-1/2 (Because ((x)^y

Answered by Reece P. • Maths tutor

10963 Views

Use Implicit Differentiation to find dy/dx of the following equation: 3(x)^2 + 8xy + 5(y)^2 = 4

(This is a common question in C4, the "hardest" module of the old A level)When differentiating we consider each term one at a time:Differentiating 3x² simply gives us 6x Differentiati...

Answered by Reece P. • Maths tutor

4186 Views

If 3 apples cost £1.50 and 4 oranges cost £3.20, how much do 5 apples and 3 oranges cost?

The answer is £4.90 and we know that this is the case because...If 3 apples cost £1.50, then one apple costs 50p and then 5 apples are 5 x 50p which is £2.50If 4 oranges cost £3.20 then one orange is £0.8...

Answered by Chris H. • Maths tutor

5096 Views