Felicia is thinking of buying some 2-liter sodas which are on sale for $0.85 each. The total cost (c) of all the 2-liter sodas will be proportional to the number of 2-liter sodas (s) that she buys. Which equation represents the relationship between c and s?
c=0.85−s
c=0.85+s
c=0.85×s
c=0.85÷s

Which answer choice?

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size.it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?

Can someone me with these two circle theorem questions asap?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )