Answer:
-x²+9x+4
Step-by-step explanation:
Hope this helps!

Cross multiply.
5.4x=9*25.8
5.4x=232.2 Divide both sides by 5.4
x=43
Answer:
11.25
Step-by-step explanation:
the equation to find the area of a rectangle is A=w*l
A=2.5*4.5
A=11.25
Answer:
Step-by-step explanation:
(2n -3)(2n+1) = 4n^2 + 2n - 6n - 3 = 4n^2 - 4n -3