According to the World Population Clock, the world population as of May 2013 was approximately 7.12 billion and growing at a rate of approximately 1.15% per year. Which equation represents this
scenario?
a. P(t) = 7.12(1.115)^t
b. P(t) = 7.12(1.0115)^t
c. P(t) = 7.12(1.00115)^t
d. P(t) = 7.12(1.15)^t

i did it myself and i got 4.2 (b) hope its right

step-by-step explanation:

the line of

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