Answer:
81a^2+16b^2
Step-by-step explanation:

Maria got 21 correct.
Number wrong = Total - Number right
y = 25 - 21
y = 4
Maria got 4 wrong.
Hope this helps!
Answer:
288ml
Step-by-step explanation:
Answer:
20.04
Step-by-step explanation:
He marked it down to 67%. Not up
Area = pi x radius squared... so
a = pi x 10in^2
a = 314.159