exam Maths Puzzle Numerical Ability

I really need help with this stuff I get so confused.
Given f(x)=-4x-4, find f(2)

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exam Other Question

solve by using the square root property.

9x^2=14

and the other problem is

(x-5)^2=7 I have hourglass figure. Total h=10. Upper cone radius=3. Lower cone radius=5 Find Volume