Answer:
The area is changing at 2 m²/d.
Step-by-step explanation:
The area of a rectangle is given by:

Where:
l is the length
w is the width
We have that the length is increasing at a rate:

And the width is decreasing at a rate:
The change in the rectangle's area is the following:
When the length is 8 meters and the width is 18 meters we have:
Therefore, the area is changing at 2 m² per day.
I hope it helps you!
Answer:
-4 = 5
Step-by-step explanation:
9-4=5
1-5=-4
-4:5
Answer:
12.A.) Heptagon
Step-by-step explanation:
So you have 12 cases delivered in 1 hour and 30 minutes. 30 minutes is half of an hour or .5
so 12/1.5 is 8, that is 8 cases per hour for a total of 32 cases in 4 hours.
Answer:
.
Step-by-step explanation:
The given series is,

When we substitute
, we get the first term, which is 
This implies that,

.
The common ratio is

The finite geometric sum is given by the formula,
.
Since there are 9 terms, we find the sum of the first nine terms by putting
in to the formula to get,
.
.
.
.
.
.
.
The correct answer is B