exam Maths Puzzle Numerical Ability

I need your help with this please.
Solve the following system by substitution. If a unique solution does not exist, state whether the system is inconsistent or dependent. 5x - 2y = -5 and y - 5x = 3

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exam Other Question

I am stuck on correct answer for:

(3 X 10^2) X (2 X 10-3)=:

The 10-3 is actually (10 to negative 3rd power) but I can't show that correctly in email.

I am not using a spec State and prove relationship between Arithmetic Progression and Geometric Progression?