Help I don’t understand

5.64 cm

Step-by-step explanation:

Since it asks how much more, this is a subtraction problem.

Dubaku's town had 8 cm and Elliot's had 2.36 cm. Subtract the two amount.

Make sure you line up decimal places. To do this, write 8 and 8.00 since there are two decimal places in 2.36.

8.00

-2.36

The decimal places and place values are lined up so now subtract.

5.64

Step-by-step explanation:

bc when I searched it up it gave me khan academy and the same question with this answer.

BTW person above me is right too

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