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Solve the simultaneous equations: 4x + y = 25, x - 3y = 16

We need to have either the same number of x's or the same number of y's in each equation so that we can add or subtract them to be left with just x or just y. We can do this by multiplying the second equatio...
LH
Answered by Lydia H. • Maths tutor
35506 Views

Prove that 0.565656.... can be expressed as 56/99.

1) Let x=0.565656... 2) Thus 100x=56.565656... 3) Subtracting equation 1) from 2) gives: 99x=56 4) Rearrange for x: x=56/99, Also x=0.565656... from 1) Therefore 0.565656...=56/99
DC
Answered by Daanyaal C. • Maths tutor
4779 Views

I am struggling with Unit 1 of the GCSE, especially question 4, the 'comparing the use of language in two texts'; how do I improve my marks on this particular question?

Question 4 is the first instance in the paper where a student is required to use more than one source, and again the first question to concentrate in-depth on the effects of language. I would advise you to f...
JG
5666 Views

What is the concentration of 0.4 moles of 25cm3 ethanoic acid?

concentration = moles / volume must convert volume into litres 1 litre = 1000cm3 (divide by 1000) c= n/v = 0.4/0.025 = 16mol/l
EM
Answered by Emma M. • Chemistry tutor
3858 Views

Why are there different impacts of flooding in MEDCs and LEDCs?

There is a difference in the impact of flooding between MEDCs and LEDCs because of socio econmomic factors. MEDCs have better flood warning systems to alert the population to the possibility of a flood occur...
MT
Answered by Matthew T. • Geography tutor
14637 Views