7. -21-17 + 25 + 65
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8)

x = 2

m<FED = 168

9)

x= 7

m<ABE = 64

Step-by-step explanation:

8)

m<FED = m<WED + m<FEW

83x + 2 = 148 + 11x - 2

83x + 2 = (11x) + (148 + (-2) : Combining like terms

83x + 2 - 11x = 11x - 11x + 146 : Subtract 11x from both sides

72x + 2 = 146 : Simplify

72x + 2 - 2 = 146 - 2 : Subtract 2 from both sides

72x = 144

72x / 72 = 144 / 72

x = 2

m<FED = 83(2) + 2

m<FED = 168

9)

m<ABC = m<ABE + m<EBC

23x+1 = 9x+1 + 98

23x + 1 = (9x) + (1+98)

23x + 1 = 9x + 99

23x - 9x + 1 = 9x - 9x + 99

14x + 1 = 99

14x + 1 - 1 = 99 - 1

14x = 98

14x / 14 = 98 / 14

x = 7

m<ABE = 9(7) + 1

m<ABE = 64