Select the correct answer. The sale of sweaters in a town changes with the temperature. If a statistical model predicts that daily sales (in dollars) are determined by the function s = 900 − 100t, where t is the temperature (in degrees Celsius), what is the temperature if sweater sales are at $1,200?

A.
–3°C

B.
0°C

C.
–4°C

D.
3°C

A. –3°C

Step-by-step explanation:

We can solve this algebraically.

The sales of the sweater are at $1200, that is s = 1,200. Substitute it to the given function as

1200 = 900 - 100t

Solving for t,

100t = 900 - 1200

100t = -300

t = -3

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.