I am assuming you wrote the problem wrong. Is it a^2?
A^2 -4A-21=0
(A-7)(A+3)=0
A=7 A=-3, ignore the negative number because it doesn't make sense if you plug in for a.
length=a+3=7+3=10
Width=7=a
6/4 or 1 and 2/4 thats a pretty easy question
Answer: 300 m
<u>Step-by-step explanation:</u>


= 150 + 150
= 300
Answer:
43cm
Step-by-step explanation:
96-10 (5 x2 sides)=86
86/2 sides=43 longest side
Answer:
I would assume you're referring to this test? if so the answer is
a, d and e