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

The ratios 3: 9, 4: 12, 5: 15, and 6: 18 are a pattern of equivalent ratios in the ratio table. which is another ratio in this pattern?

Which of the following parabolas opens down?

Asystem of linear equations contains two equations with the same slope. select all of the correct statements. i a. the system may have two solutions. - b. the system may have infinitely many solutions. c. the system may have one solution. o d. the system may have no solution. submit