A textbook store sold a combined total of 309 sociology and history textbooks in a week. The number of sociology textbooks sold was two times the number of history textbooks sold. How many textbooks of each type were sold?

Rob spent 25%, percent more time on his research project than he had planned. He spent an extra h hours on the project. Which of the following expressions could represent the number of hours Rob actually spent on the project?

Is the squence 10, 30, 50, 70 arithmetic or linear

The fastest that a seahorse can travel is 2640 feet per hour. what is its top speed in miles per hour

Write a recusive rule for a sequence where every term is the same.

Kendall's sister had 25 hair clips. 7 of them were blue and the rest were purple. What percent of Kendall's sister hair clips were purple?

The set of ordered pairs below represents a linear function. { (-2, - 3), (0, - 2), (2, - 1), (x, y) } What is one other pair of coordinates that could be the missing ordered pair (x, y), in this set?

What is - 15.5/5 simplified

What is an expression with a negative exponent that has a value between 0 and 1/2

What is 1.8 increased by 10 to make a new mean

Assume that y varies directly with x. If x = - 4 when y = - 8, find y when x = 6.