**Answer:**

Formula for Volume=4/3 π r^3

**Step-by-step explanation:**

To get this answer you would multiply 42 times 39%

**Answer:**

The total number of Cats and Frogs

**Step-by-step explanation:**

Number of Birds Owned = B

Number of Cats = C

Number of Frogs =F

The expression that represents the total number of pets owned by Kelby

=B+(C+F)

**NOTE: SUM/ADDITION = +**

Therefore:

The expression **C+F ** represents the total number of Cats and Frogs owned by Kelby.

**Answer:**

**Step-by-step explanation:**

Solve the system:

8x−4y=20

4x−8y=4

Reduce the first equation by dividing every term by -2:

-4x + 2y = -10

and then combine this result with the second equation:

4x−8y=4

-4x + 2y = -10

--------------------

-6y = -6, and so y = 1.

According to the first equation, if y = 1, then 4x - 8 = 4, or x = 3.

Then x = 3 and y = 1.

So, finally, x - y = 3 - 1 = 2

then find y and plug that y value into one of the original equations to find x

Hope this helps!