How do I solve 21r<7?

How to write 12,400,000 in scientific notation?

A bag contains white marbles and red marbles, 69 in total. The number of white marbles is 1 more than 3 times the number of red marbles. How many white marbles are there?

A store sells 4 cans of nuts for $9. How much would it cost you to buy 7 cans of nuts?

A red light flashes every 14 minutes. A blue light flashes every 24 minutes. When will the two lights flash together again, if they last flashed together at 8 AM?

Eight more than the product of 2 and a number x write this expression

Start at 7 and subtract 3each time

Suppose you know the area of a circle and the measure of the central angle of a sector. Describe the process of finding the area of the sector.

Cups are sold 8 a package and plates are sold 12 to a package. If you want to have the same number of each item for the party, how many of each do you need to buy? what is the least number of packages of each you need to buy?

What is the formula for the sum of an infinite geometric series

Denise put $95 into an account that pays 5.2% interest, compounded monthly. According to the rule of 72, approximately how long will it take for her money to double?