Sally has a horrible cell phone plan. She must pay $40 for service and $0.75 per text message. How many text messages did Sally send if she paid $190 last month on her cell phone bill.​

What is the value of the expression below? (81^2)^1/8

On saturday morning, calls arrive at ticketmaster at a rate of 108 calls per hour. what is the probability of fewer than three calls in a randomly chosen minute?

You can ride your bike around your block 6 times and the whole neighborhood 5 times in 16 minutes. you can ride your bike around your block 3 times and the whole neighborhood 10 times in 23 minutes. how long does it take you to ride around the neighborhood?