exam Maths Puzzle Numerical Ability

I am stumped. HOw do I go about solving and graphing 4raised to the x power = 25

4^x=25

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exam Other Question

Please help me solve the equation: (2 + 2i) and ( 2 - 2i)
I have no idea have to solve this. A lawn mover repair shop borrowed $1,500 for 90 days. If the proceeds of the loan were $1,470, find the discount rate.

a. 3.75%
b. 8 1/3%
c. 4%
d. 8