exam Maths Puzzle Numerical Ability

A bacteria culture started with a count of 720 at 8:00 A.M., and after
t hours is expected to grow to f(t)=720(3/2)t Estimate the number of
bacteria in the culture at 11:00 A.M. the same day.
a. 1620
b. 2160
c. 2430
d. 2880

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exam Other Question
√8-x+6=4 Ok

We have a right triangle, the hypotanuse is R+4, one of the legs is R and one is 8. I get (4+r)^2=r^2+8^2 .. how do i solve this with out the r^2 canceling out?