Answer:

Step-by-step explanation:


Answer:
The rate of change is
ft^(2)/min
Step-by-step explanation:
The area of a circle is given by the following equation:

To solve this question, we have to realize the implicit differentiation in function of t. We have two variables, A and r. So

We have that:
.
We want to find 
So


Since the area is in square feet, the rate of change is in ft^(2)/min.
So the rate of change is
ft^(2)/min
3,200,00 converted to scientific notation is 3.2 x 106
That would be 3.5 b/c it can’t be expressed as a ratio or a simple fraction
Answer:
x=20
Step-by-step explanation:
inverse operation
add 7 to both sides
x=20