exam Maths Puzzle Numerical Ability

I would like to know how to solve these equations in its simplest form

1. 3/8(16x-8)+2/3(15y+12)=

this is as far as i have gotten
128x-8+75y+12
128/8

2. 1.13(2.4x-6)-8.2(2x-7.7) i did not know how to start this problem

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exam Other Question

f(x)=x squared 2 - 4x+3

a) find domain and range of th function
b)determine if it is odd,even or neither. justify your answer.
c) sketch graph
Solve the system by addition

4x+8y=-1
8x-4y=-7