Two boxes are stacked together. what is the combined volume of the two boxes? a. 105 cm b. 280 cm c. 385 cm d. 4,200 cm

The formula of a volume of a rectangle prism:

l - length

w - width

h - height

The larger rectangle prism:

Substitute:

The smaller rectangle prism:

Substitute:

Total volume:

to have more of what you want like money

step-by-step explanation:

save it by not spending on unnecessary stuff and have more

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