lilyanne0612
lilyanne0612 lilyanne0612
  • 15-07-2020
  • Mathematics
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ivy46 ivy46
  • 15-07-2020

21

[tex] \frac{1}{2} height \: of \: trapezium(a + b) = area \: of \: trapezium[/tex]

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

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