The gcf of 9 and 11 is 1.
15) x=31/10
16)x=2
17)x=16/3
18)x=-2
19)2.5 hours
20) 32 hours
Go to the third pic for your answer. I got problem 4 wrong but it shows the correct answer.
Answer + Step-by-step explanation:


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15⁶ × 15³ = 15⁶⁺³ = 15⁹
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<u>Recall</u> : If a ≠0 ⇒ a⁰ = 1
Then
Since 6⁸ ≠ 0 ⇒ (6⁸)⁰ = 1