At the local chapter of Mensa, each member brought three prospective members to the end of the year gala. There were a total of 76 people who attended the gala. How many were prospective members? A. There were 19 prospective members
B. There were 38 prospective members
C. There were 60 prospective members
D. There were 57 prospective members

i need more info. are you looked to see there mph? how much they deliver? how far they go?

step-by-step explanation:

35-60 students are taking math.

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240