The population, in millions, of a city t years after 1990 is given by p(t)=3.1+0.07t a. 3.1 million is the population of the city in 1991 and 3.17 million is the population in 1992. c. 3.1 million is the population of the city in 1990 and 0.07 million is the increase per year in the population. b. 3.1 million is the population of the city in 1990 and 0.07 million is the decrease per year in the population. d. 0.07 million is the population of the city in 1990 and 3.1 million is the increase per year in the population.

the independent number is 3.1 which would be the population in 1990, then since t multiplies by 0.07 that would be the increase every year so the correct answer is:

c. 3.1 million is the population of the city in 1990 and 0.07 million is the increase per year in the population.

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