Question

Keiko surveyed people with cell phones.

Ages in years = a

Texts they send per day = t

He drew a best-fit line and determined its equation.

Evaluate how many texts a 15 year old would send each day according to Keiko's trend line equation.

Answer 1

67.69

Explanation:

You have your equation, t = -1.63 a + 92.14

a = age

a = 15

if you update your equation to fill in for a you get:

= -1.63 (15) + 92.14

-1.63 x 15 = -24.45

-24.45 + 92.14 = 67.69

67.69

Answer 2

67.69

Explanation:

You have your equation, t = -1.63 a + 92.14

a = age

a = 15

if you update your equation to fill in for a you get:

= -1.63 (15) + 92.14

-1.63 x 15 = -24.45

-24.45 + 92.14 = 67.69

67.69