The United States uses 4 * 109 megawatt hours of electricity in a year. Mexico uses 2 * 108 megawatt hours in a year. How many times more megawatt hours does the United States use than Mexico in a year?

At the start of the day there are 78 boxes of DVDs in a warehouse. Each box has 116 DVDs. Then 19 of the boxes are shipped. Now how many DVDs are left in the warehouse?

1/3x+y=9, - 2x+2y = - 6 ... what is x and y, using the substitution method?

You have 1 case of soap bars and there are 150 bars in a case. you have 300 bars of soap per day. how many cases do you need to order to have enough for 7 days

A Student found the product of 5x10^8 and 6x10^5 to be 3x10^13. What is the error? What is the correct product?

What is ten thousand more than 300,000 + 99,000+5,000+40 is somebody tell me the Answer

Mrs. Travis wants to have a clown deliver balloons to her secretary's office. Clowns R Fun charges $ 1.25 per balloon and $ 6 delivery. Singing Balloons charges $ 1.95 per balloon and $ 2 for delivery. What is the minimum number of balloons? Mrs.

2 other decimal forms of 6.7

Describe a general method for deciding which variable to eliminate when using linear combinations. can all systems be solved by linear combinations? Explain

Janet hikes a trail at a local forest each day. The trail is 3.6 miles long, and she has hiked 5 days in the past week. How many miles has Janet hiked in the past week?

the test scores for 10 students were 61,67,81,83,87,88,89,90,98, and 100. which frequency table represents this data set?