Answer:
Y = acos( X ) returns the Inverse Cosine (cos-1) of the elements of X in radians. The function accepts both real and complex inputs. For real values of X in the interval [-1, 1], acos(X) returns values in the interval [0, π].
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Answer:
If the month is 30 days You will have $2,640 at the end of 30 days.
Oi
Just calculating the differential. Step by step:

If you want to know where the tangent has no slope:
Answer:
I DONT UNDERSTAND ANY OF THIS
Step-by-step explanation:
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1219 square feet
Step-by-step explanation:
cause