The number of pens used varies directly with the number of pieces of paper needed. If 12 pens are used when 40 pieces of paper are needed, how many pens will be used when 240 pieces of paper are needed?

Round each number to the nearest thousand. Which is the best estimate for the sum of 472,378+178,261? a. 650,000 b. 650,600 c. 651,000 d. 652,000

Ken went to the store for his mother. He spent $2.37 on groceries. In addition, his mother said he could spend $0.35 on candy. What was his change from a five dollar bill?

The sum of two numbers is 42 and the difference is 14. What are the numbers?

The grades on the last history exam had a mean of 75%. Assume the population of grades on history exams is known to be normally distributed with a standard deviation of 7. What percent of students earn a score between 70% and 82%?

Alaina's sugar cookie recipe calls for 2 1/4 cups of flour per batch. If she wants to make 2/3 a batch of cookies, how much flour should she use? A) 2/9 cups B) 1 1/2 cups C) 2 1/6 cups D) 3 3/8 cups

Which expressions are equivalent to 76 (3 + c) ?

The difference of 7 and a number x is 10

in 1995, there were 12,000 students at Beacon High. In 2000, there were 12,250. What is the rate of change in the number of students

Between which two thousands is the number 36,219

Find all the values of x for which the function is differentiable. f (x) = (x^3-8) / (x^2-4x-5)