How many significant figures does 2,090 have

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

One cell phone plan charges $20 per month plus $0.15 per minute used. a second cell phone plan charges $35 per month plus $0.10 per minute used. write and solve an equation to find the number of minutes you must talk to have the same cost for both calling plans.