In the year 1900, the total number of metric tons of copper produced in the world was
495,000. Each year since 1900, the total number of metric tons of copper produced has
increased on average by about 3.25% over the amount produced the previous year.
Which function models the total number of metric tons of copper produced in the year that is
x years since 1900?
A
c(x) = 495,000(1.0325)*
B c(x) = 495,000(0.9675)*
C
c(x) = 495,000x1.0325
D (x) = 495,000x0.9675

A. c(x) = 495,000(1.0325)*

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

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step-by-step explanation: