exam Maths Puzzle Numerical Ability

A vending machine will accept nickels and dimes only. The attendant checks the machine and finds 42 coins whose value is $3.40. How many coins of each type were there?

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exam Other Question

Find the following if f(x) = 4x -3 f(-1)

-1 = 4(-1) - 3
-1 = -4 -3
-1 = -1

Double checking to see if I did these right The length of a rectangle is 2 in. more than twice its width. If the perimeter of the rectangle is 34in., find the dimensions of the rectangle.