To solve this problem you must apply the proccedure shown below:
1. Clear the radius from the formula for the circumference of a circle and substitute values, as following:

2. Substitute the radius calculated into the formula for calculate the surface area of the sphere:

The answer is: 

The difference is the result of a subtraction problem.
We are given two values that are being subtracted: 54 and a number, represented by 
So, represent this mathematically with
.
Answer:

Step-by-step explanation:
We are given the equation
. To find y-value when or at x = 3, simply substitute x = 3 in which gives us
then evaluate the value as we obtain the y-value or final answer to the question:

If you have any questions about this question or for clarification, do not hesitate to ask in comment!
Answer:
45min
Step-by-step explanation:
just mutiply
Combine like terms.
10x+6=24+9x
Put variables to one side and the constants to another.
x=-18
There is only one solution.
Hope this helps!