There are 360 7the grade students at eisenhower middle school. One fourth of the students went to clermonth elementary. Of the rest half went to central elementary and the others came from other schools. How many students came from central elementary?

Step-by-step explanation:

1/4x + 1/2x + 1/4x = 360

4(2/4x + 1/2x = 360)

2x + 2x = 1440

4x = 1440

x = 360

1/4(360)= 90 Clermonth

1/2(360)=  180 Central

1/4(360)= 90 other schools

i dont know sorry

step-by-step explanation:

(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