David purchased some cookies at the cost of 5 for $4 and sold 4 for $5. He made a profit of $90. How many cookies did he purchase and sell to make that much money

Socks cost $2 per pair. The cost of n pairs is $2n. John says that the cost of 6 pairs is $26 and the cost of 7 pairs is $27. Is this correct? What did John do wrong?

Perform the indicated operation 1 2/3 + 5 3/8

How can you tell a graph is proportional

At a grocery store, Ruth sees that a 15-ounce can of pumpkin costs $1.59 and a 29-ounce can of pumpkin costs $3.05. Which is a better buy

Find the least common denominator for these two rational expressions - 1/y 2/5y

When solving the equation, which is the best first step to begin to simplify the question? - 2 (*+3) = - 10 a. (-2) (-2 (x+3) = - 10 (-2) b. - 1/2 (-2) (x+3) = -10 (-1/2) c. - 2/2 (x+3) = - 10/2 d. - 2/-10 (x+3) = - 10/-10

A sphere has a volume of 32/3pi cubic units. What is the radius of the sphere?

1 1/3 - 3 3/4 1.3 1/4 2.3 4/9 3.5 1/4 4.5

Amount sugar in a candy bar decreased by 6.7% to 3.2 grams how much sugar wascin the candy before the decrease?

Two mechanics worked on a car. The first mechanic charged $85 per hour, andthe second mechanic charged $70 per hour. The mechanics worked for a combinedtotal of 20 hours, and together they charged a total of $1625. How long did each mechanic work?