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
<h3>Answer: the length = 3 u.</h3>
Simplified: 10
(4*3)=12
1/3*12=4
4+6=10
6,975/18 = 387.5 This is how much he makes per week.
387.5/25= $15.50 per hour
Gary makes $15.50 an hour.
What are you trying to show us
1 cup is required, you just have to divide 27 by 3 to get 9 which is one cup :)