Question

Please help me desperately need help

Answer 1

9) 15

10)22

11)25

Explanation:

9)

`area=(bh)/(2) \\30=((2x+1)4)/(2) \\\\30=4x+2\\\\28=4x\\x=7\\`

substitute:

=2x+7

=2(7)+1

=15

10)

`area=(bh)/(2) \\114=(12(3x-2))/(2) \\114=18x-12\\126=18x\\7=x`

substitute:

=3x-2

=3(7)+1

=22

11)

`area=h(b1+b2)/(2) \\\\69=(4x-2)/(2) \\\\69=(24x-12)/(2) \\\\69=12x-6\\75=12x\\x=6.25\\\\=4x\\=4(6.25)\\=25`