Answer:
16.6...
Step-by-step explanation:
(x+9)(x+10)
9*10=90
9+10=19
10 revolution ot takes
x = 17
Combine like terms first:
x + 3x + 4 = 72 --> 4x + 4 = 72
Isolate the variable by subtracting 4 from both sides so you get
4x = 72 - 4
4x = 68
Divide both sides by 4 to get
x = 68/4
x = 2
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