Exam Maths Puzzle Time Distance and Speed

A boat went 10 miles upstream and 10 miles downstream. If the current is 3 mph what is the rate of the boat?

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Exam Other Question

3^(2x) - 5(3^x)+ 4 = 0
(Tmiddle term is 5 times 3 to the x)
Can someone please show me how to do the following problem:

Solve for X, Y, and Z in the following:

22x + 5y + 7z = 12, 10x + 3y + 2z = 5, 9x + 2y + 12z = 14