Carlon plans to evaporate a number of gallons of water from 90 gallons of a 15% salt solution to make a 25% salt solution. which equation can he use to find x, the number of gallons that should be evaporated?

36 gallons of water need to be evaporated.

Step-by-step explanation:

Let x gallons be the amount of water needed to be evaporated. Then (90 - x) gallons of solution will left.

1. Calculate the amount of salt in 90 gallons of a 15% salt solution:

2. Calculate the amount of salt in (90 - x) gallons of a 25% salt solution:

3. The amount of salt remains unchanged, so

4. Solve this equation:

36 gallons of water need to be evaporated.

sss (side, side, side)

sas (side, angle, side)

asa (angle, side, angle)

aas (angle, angle, side)

hl (hypotenuse, leg)

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