Suppose that the number of inhabitants of country a is given by y=-7.24x+937.69 million, and the number of inhabitants of country b is given y=2.16x+834.29 million, where x is the number of years since 1960. Find the year in which the number of inhabitants of country A equals the number of inhabitants of country B

11 years

Step-by-step explanation:

For country A;

y = —7.24x + 937.69

For country B;

y = 2.16x + 834.29

To find the number of years in which inhabitants of country A equals the number of inhabitants of country B, we equate both equations together as shown below:

y = —7.24x + 937.69 (1)

y = 2.16x + 834.29 (2)

Equate equation (1) and (2)

—7.24x + 937.69 = 2.16x + 834.29

Collect like terms

—7.24x — 2.16x = 834.29 — 937.69

—9.4x = — 103.4

Divide both side by the coefficient of x i.e —9.4x

x = — 103.4/—9.4

x = 11

Therefore, it will take 11 years for the inhabitants of country A to equal the number of inhabitants of country B

-13

step-by-step explanation:

f(x)=2x-5 for f(-4)

f(-4)   means let x=-4

f(-4) = 2(-4) -5

f(-4) =-8-5

      = -13