The Nguyen family and the Cooper family each used their sprinklers last summer. The water output rate for the Nguyen family's sprinkler was 30L per hour. The water output rate for the Cooper family's sprinkler was 35L per hour. The families used their sprinklers for a combined total of 40 hours, resulting in a total water output of 1325L. How long was each sprinkler used?

answer is 67%

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c

i think the answer is true

step-by-step explanation: