Pleaseee helpo me

Student C has the mistake.

Step-by-step explanation:

4y2+5y−8y2+4−2y

=4y^2+5y+−8y^2+4+−2y

Combine Like Terms:

=4y^2+5y+−8y^2+4+−2y

=(4y^2+−8y^2)+(5y+−2y)+(4)

=−4y^2+3y+4  or 3y - 4y^2+4

the answer is 9.8975

explanation:

when you multiply the "39.59" with the 25% it reduces it and shows its final discounted price. hope this !

step-by-step explanation:

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