Answer:
0
Step-by-step explanation:

10-10 is zero and Anything multiply by a factor of 0 equal 0 so
0 is the answer
If you were to buy 5 DVDs and 3 videotapes, For 5 DVDs, it would be $40 for 5 DVDs, and $18 for 3 videotapes. I hope this helps :)
Each student sells 9 balloons because 162 balloons divided by 6 groups of students is 27, and 27 divided by 3 students is 9 balloons.
The answer is 8x^2+34x+21