Haley is twice as old as Riley. The sum of their ages is 39. Write an equation that represents (x), Riley's age.

Mrs. Smith has 24 boxes of ornaments. Each box has 15 ornaments in it. She will use 185 ornaments on her tree this year how many ornaments will not be used?

Which of the following is equivalent to 10000 lb?

Add. (2x^4+x^3-4x^2+3) + (4x^4-2x^3-x^2+10x+2)

What would x be in 5x=55

Use the substitution method to solve the system of equations. y = 4x 8x + y = 18 A (8 B. (66) c. (2,8) D. (2, 2)

Speed of Plane A = 415 mph. Speed of Plane B = 375 mph. Both planes leave from New York City at the same time. Plane A flies due North. Plane B flies due South. After 4 hours, how far is Plane A from Plane B (to the nearest mile) ?

A rectangle has an area of 135ft what is the length if the width is is 9ft what is the variable in this sentence

Two variables are always sometimes I never) correlated. 4. In the U. S., from 2004 - 2015, the correlation coefficient for the relationship between the size of a cell phone data plan, x, and the number of text messages sent, y, is r = + 0.97.

Mobile people moving company increased its number of employees from 22 to 27 what is the percent increase round to the nearest tenth of a percent

Don is planning on driving his car to a business meeting. The distance to the meeting place is 1243 miles. If his car gets 30 mpg, and current cost of gas is 2.79 per gallon, how much will he have to pay for gas alone?