The new donut shop sold 210 donuts in the first hour at the same rate how many donuts would the shop sell in 90 minutes solve the word problem using unit rates A 325

B 415

C 305

D 315​

315 (D)

Step-by-step explanation:

210/60 to get donuts per minute = 3.5 donuts per minute

3.5x90= 315

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