The quadratic function f left parenthesis x right parenthesis equals 740.1 x squared minus 3109.2 x plus 945 approximates the growth of cell phone subscribers between 1985 and 2002 where x is the number of years past 1985 and f left parenthesis x right parenthesis is the number of subscribers in thousands. a. Use this function to approximate the number of subscribers in 1998. b. Use this function to predict the number of subscribers in 2009.

(a) 85,602,300

(b) 352,621,800

Step-by-step explanation:

(a) In 1998, x = 1998 - 1985 = 13

The number of subscribers in 1998 = 85602.3 × 1000 = 85,602,300

(b) In 2009, x = 2009 - 1985 = 24

The expected number of subscribers in 2009 = 352621.8 × 1000 = 352,621,800

so firstly, we need to isolate the y variables to be able to solve these inequalities. firstly, add 0.5x on both sides of the first inequality and subtract 1.5x on both sides of the second inequality:

now since the slope is positive for the first inequality, this means that the line going upwards belongs to the first inequality, and the line going downwards belongs to the second inequality.

next, since y ≥ in the first inequality, this means that the shaded region will be above the first inequality's line, thus shading regions a and b.

next, since y ≤ in the second inequality, this means that the shaded region is going to be below this line, thus shading regions a and c.

since both lines shade region a, this means that region a is the solution.

step-by-step explanation:

mark brainliest!

4

step-by-step explanation:

im pretty sure it's 4 beacsue 8/2 equals 4