exam Maths Puzzle Numerical Ability

Simplify the expression. Write your answer with positive exponents.

-25^-3/2

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exam Other Question

A realty office receives a commission of 8% on the sale price of houses listed and sold. if Such commissions totalled $60,400 in a month, what was the value of the houses listed and sold? Then angle x satisfies the equation 2tan^2x-5secx-10=0, where x is in the second quadrant. Find the exact value of sec x.

I know that the identity of 1+tan^2x=sec^2x may help me in this problem, but I am not sure what to do next. Thanks a lot!.