Find the value of x. PLEASE HELP ASAP

Mathematics

1 answer:

Elan Coil [88]3 years ago

5 0

Hi there!

$\large\boxed{A. \text{ } 7}$

The following trapezoidal theorem states that:

Middle segment = average of top and bottom side

Thus:

M = 1/2(b1 + b2)

21 - x = 1/2(17 + 11)

Solve:

21 - x = 1/2(28)

21 - x = 14

Subtract 21 from both sides:

-x = 14 - 21

-x = -7

Multiply both sides by -1:

x = 7

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