Liz made a 13-minute long-distance call that cost her $1.45 for the first 3 minutes and $.22 a minute for each extra minute. How much did
the call cost her?
a. $3
b. $4.31
c. $.37
d. $3.65

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

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.

Use the equation and type the ordered-pairs. y = 2 ^x