Messick127
20.09.2019 •
Mathematics
The width of a rectangle is 8 units less than the length. the area of the rectangle is 9 units. what is the length, in units, of the rectangle?
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Ответ:
a=9
a=lw
9=(l-8)l
9=l²-8l
0=l²-8l-9
factor
0=(l-9)(l+1)
set to zero
l-9=0
l=9
l+1=0
l=-1, false length can't be negative
l=9
the length is 9 units long
Ответ:
joe is able to build one ten foot section in 5 hours, that is
he complete one, ten foot in 5 hours. so he completes one foot section in
and 120 feet long section in
bill is able to finish a ten foot section in 4 hours. therefore he completes one foot section in
so he completes 120 foot section in
so there together 1hour work is
so they complete the work in