Im not entirely sure but i got 3x^2y
Answer:
The correct option is a) n(n-4).
Step-by-step explanation:
Consider the provided information.
Let n represents the number of rows.
The number of seats in each row is 4 less than the number of rows.
This can be written as: 
A theater has n rows of seats.
Therefore the total number of seats in the theater is:

Hence, the correct option is a) n(n-4).
It’s answer A I believe bc none of the others check out
Answer:
7/14 and 6/14
Step-by-step explanation:
we are trying to find the same denominator for the 2 fractons, so 1/2 times 2 to both sides would be 7/14. and 3/7 times 2 to both sides would be 6/14. (same denominator)
Answer:
You can calucate b by using pythagorean theorem:
a² + b² = c²
21² + b² = 29²
b² = 841 - 441 = 400
b = √400 = 20 (m)