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?

21 Celsius.

You add 900 to 1,200 to get 2,100. Then you divide that by 100 to get 21. Hope this helps!

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.

What exactly is your question?