exam Maths Puzzle Numerical Ability

How do I add this equation?
-8+9-+5=

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exam Other Question

I need help with this homework problem:
t+22/t square-t-72 + 8/t-9 = 4/t+8

Thank you. A spherical balloon is being inflated. Estimate the rate at which its surface area is changing with respect to the radius when the radius measures 20 cm.

Answer: 160pi cm^2/cm
How do I get it though?