Trevor has a family photograph that measures 4 inches wide and 6 inches long. He wants to enlarge the photo and hang it on the wall. if the length of the enlarged photo is 30 inches, what is the width of the enlarged photo?

20 inches

Step-by-step explanation:

To solve this problem, we need to cross multiply. Lets input the values (4, 6, 30) as shown below:

Next we cross multiply. We multiply 4 and 30, and we multiply 6 and x.

Now, lets put the values above back into the equation:

Our last step is to divide 120 by 6 to get x by itself.

The answer is 20 inches.

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.