The equation a = 1/2(b1 + b2)h can be used to determine the area, a, of a trapezoid with height, h, and the base lengths, b1 and
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If you mean "how to write the sum", the answer is
The result of this sum is , because you start from 2 on the number line and take 3 steps to the left (negative integers mean going left, positive integers mean going right)