What is 390000000 in scientific notation

What is 123456 + 12345678=

Solve. 4 x+15/5 x = 1/2 Show all work.

how to write a word problem for |20|=20

Hernando's salary was 49,500. last year his year salary was cut to 44,050. Find the percent decrease.

Suppose one of three bells rings first each day. Each day the bells are rung in random order. What is the probability that the same bell rings first three days in a row?

A dump truck is careying 4250 pounds of gravel. There are 2000 pounds in a ton. Express the weight of the gravel in tons only by using a mixed number. If necessary, simplify the fraction part of the mixed number.

A marketing research company desires to know the mean consumption of milk per week among males over age 25. They believe that the milk consumption has a mean of 2.5 liters, and want to construct a 85% confidence interval with a maximum error of 0.

Four friends go mout to dinner and decides to split the bill evenly. each friend orders a soda for 2.00, an entree for 12.99 and they all four share a dessert for 7.99 how much is the total bill

I need to know what is 5: 1 -- 4

April can buy a package of 10 folders for $1.20 or a package of 8 folders for $1.12. What is the unit price, per folder, in each package?