GUYS! I already made a similar post, but seriously?! I really want to help you guys, but I can't when all you do is post a picture and say "do it". I CAN'T SEE PICTURES!! MY SCHOOL BLOCKED ALL "NON-OFFICIAL" PICTURES!!

20 only answer if 100% sure most high school-aged teens are very active. a. true b. false

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

The function a represents the cost of manufacturing product a, in hundreds of dollars, and the function b represents the cost of manufacturing product b, in hundreds of dollars. a(t) = 5t + 2 b(t) = 7t - 2t +4 find the expression that describes the total cost of manufacturing both products, a(t) + b(t). a. 7t^2 - 7t + 2 b. 7t^2 + 3 +6 c. 7t^2 + 7t - 6 d. 7t^2 - 3t + 6