Top answers

Maths
GCSE

Expand and simplify 2y+3y(5y+3)

BIDMAS 

Following BIDMAS, multiply the bracket out before the addition of the 2y.

3y(5y+3) = 15y2+9y 

adding the 2y gives the calculation of 15y2 + 9y +2y = 15y<...

ES
Answered by Emma S. • Maths tutor
5163 Views

Solve the equation (2X + 3) / (X-4) - (2X - 8) / (2X + 1) = 1

In order to solve this equation we need to find a common denominator for the 2 fractions. It is impossible to name the common denominator while working with unknown variables such as x,y etc. but we know ...

OG
Answered by Octavian G. • Maths tutor
5085 Views

Smartphones are on sale. A smartphone now costs only 80% of its original price. By how many per cent would we need to increase the current price of the smartphone in order to bring it back to the original price?

Let a be the original price, b - the current price, and x - the answer we are looking for, so we need to increase b by x

AP
Answered by Aleksejs P. • Maths tutor
3168 Views

In a sale the price of a shirt is reduced by 60%. The sale price is £7.98. What is the original price?

Reduced by 60%=4/5 Original price * 0.4=£7.98 Original price=7.98/0.4=19.95 ∴ Original price= £19.95 

RR
Answered by Riccardo R. • Maths tutor
6826 Views

Kelly is trying to work out the two values of w for which 3w-w^3=2. Her values are 1 and -1. Are her values correct?

Sub in her values to see if the LHS and the RHS of the equation equate:

w=1:  3(1)-(1)^3=2  >>>  3-1=2  >>>  2=2  ✅

Therefore 1 is a correct value.

w=-1: 3(-1)-(-1)^...

EB
Answered by Emma B. • Maths tutor
4422 Views

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