Top answers

Factorise x^2 - 8x - 20

x^2 - 8x - 20 (x - 10)(x+2) (Explanation and helping understanding) Remember the last 2 numbers must multiply to equal the last number in the question and add together to equal the middle number. See that th...
CS
Answered by Christian S. • Maths tutor
5065 Views

Expand 5(2x-6)

To begin answering this question create a small grid put 5 on the left hand side and put 2x and -6 seperately at the top of the grid then you can multiply 5 by 2x to gain 10x and multiply 5 by -6 to gain -30...
ZY
Answered by Zaarah Y. • Maths tutor
8929 Views

Claire drove from Manchester to London, it took her 4 hours at an average speed of 85 km/h. Matt drove from Manchester to London, it took him 5 hours. Assuming he took the same route as Claire and took no breaks, work out his average speed in km/h.

Distance = 4 x 85 = 340km Average speed = 340 / 5 = 68 km/h
FH
Answered by Farhat H. • Maths tutor
3778 Views

Make b the subject of the formula a = 3 - 2b

So this question wants you to rearrange the formula so that b is on its own on one side of the equals sign. As its a formula and not asking for the value of the equation you don't have to worry about solving...
CB
Answered by Calum B. • Maths tutor
14878 Views

A shop sells bags of crisps in different size packs. There are 18 bags of crisps in a small pack (£4), 20 bags of crisps in a medium pack (£4.99) and 26 bags of crisps in a large pack (£6). Which size pack is the best value for money?

You can use the price of each pack and divide it by the number of bags of crips to get the price per packet, the one with the lowest price per packet will be the best value for money. The small packet cost £...
KG
Answered by Kahina G. • Maths tutor
14944 Views