exam Maths Puzzle Numerical Ability

Can someone help me figure this problem out? thanks

A= 1/2h (a+b)
Solve for a

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exam Other Question

If f(x) is a parabola, then:

a. it is a step function
b. it is a continuous, smooth function
c. it is a piecewise function
d. it is a square root function Courtney has nickels and quarters in her toy bank. She has a total of 52 coins with a total value of $9.20. How many coins of each kind does she have?