X − 5 = 17 A) x = 22 B) x = 12 C) x = 3.4 D) x = -12
1 answer:
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Answer:
Step-by-step explanation:
For this case we must determine the inverse of the following function:
Step 1:
We would write
or
Step 2:
We clear x:
Step 3:
"x" and "y" are exchanged:
The inverse is:
If Nate paints the wall in 4 hours, it means that he can paint 1/4 of the wall every hour.
Similarly, if Jill paints the wall in 7 hours, it means that he can paint 1/7 of the wall in one hour.
So, together, they paint the following fraction of the wall in one hour:
.
At this rate, they need 28/11 hours to paint the whole wall, in fact, after that amount of time they paint
i.e. the whole wall