The function f(x)equals2.8 startroot x endroot plus 19.9 models the median height, f(x), in inches, of boys who are x months of age. the graph of f is shown to the right. complete parts a through c below.
according to the model, what is the median height of boys who are 35 months old? use a calculator.
the median height of boys who are 35 months using the model is approximately
nothing
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month per in.
months.
in. per month.
in.
(type an integer or decimal rounded to the nearest tenth as needed.)

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answer: integers are just whole numbers: positive, negative, and zero.

i = {-∞, -2, -1, 0, 1, 2, 3, ∞}

let x = 1st integer

let y = 2nd integer

x = 3y + 17   {equation 1}

xy = -24         {equation 2}

substitute 3y+17 in place of x n equation 2

and solve for y.

(3y+17)y = -24

3y2 + 17y = -24

3y2 + 17y + 24 = 0

from quadratic equation:

y = [-17±√(172-4(3)(24))]/(2(3))

y = (-17 ±√1)/6

y = (-17+1)/6   or     y = (-17-1)/6

y = -16/6           or     y = -18/6

y = -2 2/3         or   y = -3

since we are dealing with

y = -3

x = 3y+17 = -9+17 = 8

the integers are -3, 8

step-by-step explanation: