exam Maths Puzzle Numerical Ability

can someone please help me?

1. Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of th

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exam Other Question
Solve: (x-5)^2 = 7

Do I use the foil method on this? Thank you! Need to solve equation 3x-1=5x-y and graph results.

This is my attempt:

3x-1-5x = 5x-y-5x
-2x-1 = -y, do I do anything else or is this the answer?