The formula of an area of a rectangle:
A = wl
We have l = w - 4 and A = 21.
Substitute:
w(w - 4) = 21 <em>use distributive property</em>
(w)(w) + (w)(-4) = 21
w² - 4w = 21 <em>subtract 21 from both sides</em>
w² - 4w - 21 = 0
w² - 7w + 3w - 21 = 0
w(w - 7) + 3(w - 7) = 0
(w - 7)(w + 3) = 0 ↔ w - 7 = 0 ∨ w + 3 = 0
w = 7 ∨ w = -3 < 0
l = w - 4 → l = 7 - 4 = 3
Answer:
make 10 copies and each will be sold for 200dollars
I solved the second equation and it’s zero, I’m not really sure how to help with the top on tho. I am really sorry :/
I hope it'll help you...
84.74 L
Step-by-step explanation:
22.3*3.8
estimate 22 gal *4 L/gal = 88L
so 84.74
To calculate,
22.3*3.8 = 84.74
the answer is 1.33