priscillarios30
10.07.2021 •
Mathematics
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Ответ:
30 min
Step-by-step explanation:
60 divided by 20= 30min
Ответ:
Length=8 Width=5
Step-by-step explanation:
Set this up as a system of equations with l standing for length and w standing for width.
w+3=l
l×w=40
Substitute rhe first equation into the 2nd one.
w(w+3)=40 > w^2+3w=40
Move all the terms to the left side
w^2+3w-40=0
Factor
(w+8) (w-5)
Set both factors equal to 0.
w+8=0 > w=-8
w-5=0 > w=5
Since distance cannot be negative we can eliminate -8. So w=5
Plug it back into any one of the equations and solve for l.
5+3=l > 8=l
So the answer is the length is 8 and the width is 5.