exam Maths Puzzle Numerical Ability

find the product
(9x-8)^2

a)81x^2+64
b)9x^2+64
c)9x^2-144x+64
d)81x^2-144x+64

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exam Other Question

Solve by substitution or elimination and specify which method you did:
6x + 2y = 10
5x - 3y = 27

(PS: Please show how you worked it out. I have been having mojor problems with these kinds of questions. Thanks.) Rachel allows herself 1 hr to reach a sales appointment 50 mi away. After she has driven 30 mi, she realizes that she must increase her speed by 15 mph in order to get there on time. What was her speed for the first 30mi?