What does it mean if two expressions are equivalent?

What two numbers add to get 12 and multiply to get 36

A shop has a sale that offers 20% off all prices. On the final day they reduce all the sale prices by 25%. Linz buys a radio on the final day. Write the overall percentage reduction on the price of the radio.

an auto transport truck holds 12 cars. A car dealer plans to bring in 1150 new cars in June and July. If an auto transport truck is filled for each delivery, except for the last one, how many full truckloads are needed and how many cars will be in

A sum of money was shared in the ratio 3:7, if the larger share is 21. What is the smaller share

An object is projected upward with initial velocity of 124 ft per sec, its height h after t seconds is h=-16^2+124t. find the height of the object after 4 seconds.

What is 950,000,000 in scientific notation?

6,8,10,12 arithmetic or geometric

There is a number, which has five digits 5abc9. If this number is the square of an integer, where a, b, c each represent a missing digit and all five digits are different, then find this number.

Andy's backpack weighs 2 1⁄4 pounds. If he removes a book that weighs 13 ounces, how much does the backpack now weigh?

Amy can run 1/10 mile per minute. How many minutes will it twke Amy to run 3 miles?