Aclass of 50 students elected a class president. candidate received 15 votes. candidate received 25 votes. the remaining students did not vote.

10

Step-by-step explanation:

15+25=40

40-50=10

40 students voted, and 10 didn't.

Step-by-step explanation:

25 + 15 = 40

50-40=10

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

i dont know

step-by-step explanation:

umm. i dont know