(the question is in the picture)

0.90n - 0.40

Step-by-step explanation:

This means that if you buy n cans, it will cost 0.90n because each can is 0.90. But, because you have a coupon for 0.40 dollars off, it is 0.90n - 0.40.

∞ this is your sign

step-by-step explanation:

ok so im not 100% sure but you would start by adding 5.1t and 1.9t beacuse they have the same variable. that is 7t.   then add -3.6 + 1.2 which is -2.4

so then keep that as -2.4 + 7t. i apologize if this is incorrect. best luck on your test < 3