A pretzel has a mass of 5 grams. What is its mass in milligrams?
(1,000 milligrams = 1 gram)

A.

0.5 milligram
B.

50 milligrams
C.

5,000 milligrams
D.

500 milligrams

The answer is c

Step-by-step explanation:

Because it tells you the mass is 5 grams and it says 1,000 milligrams is 1 gram so 1,000 times 5 is 5,000

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