1. The Field Trip committee uses the equation C=30x + 245 to determine the cost (c) for the number of students (s) who go on the trip to Hershey Park. a. Use the equation to determine the cost if 18 students visit. b. Use the equation to determine the number of students if the cost is $965.​

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.

b mark me branliest thx

step-by-step explanation: