Trapezoid. The diagonals of all parallelograms bisect each other. Trapezoid are not parallelograms.
To find the mean <span>Just add up all the numbers, then divide by how many numbers there are.
7 sets of numbers
the sum of all numbers is 105
105 </span>÷ 7 = 15
so the mean of the years is 15
Answer:
c = (ef-ab)/d
Step-by-step explanation:
ab+cd = ef
Subtract ab from each side
ab+cd -ab = ef-ab
cd = ef-ab
Divide by d
cd /d =(ef-ab)/d
c = (ef-ab)/d
Step-by-step explanation:
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