Answer:
b^5
Exponent rule when dividing = subtract exponents
b^12 - b^7 = b^5
Step-by-step explanation:
16 ..............::......
We have the equation:

Fist we add the b on the right side of the equation.

For the second step we multiply d to the right side of the equation
Answer:the answer is 15
Step-by-step explanation:
Simple we add 25+25 and get 50. Then we subtract 65-50 and get 15
Crystal has 121 compact discs. The total number of boxes required are 5.
<u>Solution:</u>
Given, Crystal has 121 compact discs that she wants to put into boxes.
Each of the boxes that she brought home holds 25 discs.
We have to find how many of these boxes will she need for all of her discs?
Now, we know that, number of boxes required 
Here we took 5 because 0.84 means that box with discs less than 25 still we require a box.
Hence, the total number of boxes required are 5.