exam Maths Puzzle Numerical Ability

Solve the indicated variable.
Area of a Trapezoid
Solve for b1:
A= 1/2h(b1 + b2)

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exam Other Question

If we could make a list of all the prime numbers, what number
would be at the end of the list? Because there are an infinite number of prime numbers,
there is no �largest prime n please help me to solve this problem: Given the points P(-1,-2) Q(4,2) and R(1,m) in the coordinate plane. find the value of m so that PR + PQ is minimum.
thanks!!!