During the winter, you charge neighbors $12 for going to their house and $9 for every hour you shovel. If you went to one house
and made $57 in one day, how many hours did you spend
shoveling?

Step by step

The answer is 5 hours.

Step-by-step explanation:

$57 minus his initial fee of $12. Leaving you with $45. Then, you take the $45 and divide it by his rate of $9 per hour and you get:

= 5 Hours

check the picture below.

well, the angle at the vertex d is clearly not a right-angle, let's check for the one at the vertex f which does look like,   however if it's indeed, that means ef is perpendicular to df, in which case their slopes will be negative reciprocal of each other.

so the negative reciprocal of the slope of ef is 1, however the slope of df is not 1, is 1/2, so nope, they're not perpendicular lines.

if you need just tell me and i will come to the rescue.

step-by-step explanation: