Sophie is building a skateboard ramp. How many Two-fifths ft pieces can she cut from a 4 ft piece of wood? Use fraction bars to model and solve the problem. Sophie can cut Two-fifths ft piece from a 4 ft length of wood.

the answer is D, 4/ 2/5

Step-by-step explanation:

got it right on assignment

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.