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PLEASE ANSWER QUICKLY!!!!!!!!!!!
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PLEASE ANSWER QUICKLY!!!!!!!!!!!

PLEASE ANSWER QUICKLY!!!!!!!!!!!-example-1
User Alexcei Shmakov
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7.9k points

1 Answer

4 votes

21


(1)/(2) height \: of \: trapezium(a + b) = area \: of \: trapezium

half the height is 3

a=7

b=x

3(7+x)=84

21+3x=84

place the like terms on one side

84-21=3x

63=3x

x=21

User Ermir
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6.5k points
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