Question

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

Answer 1

A. –3°C

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