Answer:
7y
Step-by-step explanation:
2+(5+y)
2+5y
=7y.............
7:
3/8 = 6/x
3x = 48
x = 16
8:
4/5 = (x+7)/40
160 = 5x + 35
5x = 125
x = 25
9:
3/8 = 12/(x-3)
3x - 9 = 96
3x = 105
x = 35
10:
4/1 = (3x+6)/x
4x = 3x + 6
x = 6
Let W=width of parking lot,
then Length = W+3
Total area = W(W+3)=550
Exapand and express in standard quadratic form
W^2+3x-550=0
Factor
(W+25)(W-22)=0
Therefore W=22 or W=-25, reject negative root, so
Width = 22'
Length=22+3=25'
Check: (area = 22' * 25'=550 sq. ft, ok)
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