Is f (x) = sec x concave up or concave down at x = 17/pi/4

Two digit number equal 2720

7 times a number is equal to 12 more than three times the number. Find the number.

Jane's game piece was on 139. She used these cards to capture a marker. +2, + 30, + 2 What number did she land on? Explain how you figured it out

How do you factor 30n^2b-87nb+30b?

5 quarters and 7 pennies what fraction of the coins are pennies?

What is 39009909 times 339494

What is 13,507,804 in standerd form

You have $500 in a saving account that earns 3% simple interest per year. How much money will be in your account in 10 years

Janet has $120. If she saves $20 per week, in how many days will she have $500?

Bob is trying to decide between two cell phone plans. Plan A has no flat fee, but the user must pay 10 cents per minute on the phone. Plan B requires a one-time fee of $20, but only requires a payment of 5 cents per minute on the phone.