Lindsay has 9 blue envelopes. she has 7 fewer yellow envelopes than blue envelopes. she has 4 times as many green envelopes as yellow envelopes. how many envelopes does lindsay have in all?

You make and sell triangular flags. each flag has a base of  3.53.5  feet and a height of  2.52.5  feet. fabric for the flags costs  $0.40$0.40  per square foot. what is the cost to make one flag?

Which of the following are accepted without proof in a logical system? check all that apply.

If there is 20 dogs in the shelter and 5 dogs get homes, and then 43 more dogs come. how many dogs are there in the shelter?