The ratio of the zinc to copper is 3 to 15. If there are 720 lb copper, how much zinc in there?

Of the 75 teachers at a school, 15 teach mathematics. What percent of the teachers at the school teach mathematics?

The sum of two numbers is eight. If seven times the smaller number is negative five times the larger number, find the numbers.

The path of a football kicked by a field goal kicker can be modeled by the equation y = - 0.04x2 + 1.56x, where x is the horizontal distance in yards and y is the corresponding height in yards. What is the approximate maximum height of the football?

Jayme built a box in the shape of a rectangular prism with the dimensions shown. What is the volume of the box, in cubic inches? A rectangular prism has a length of 8 inches, a width of 2 inches, and a height of 4 inches.

A 50 foot ladder is placed at 30 feet away from the building in order to reach the 3rd floor of the building. How high is the 3rd floor?

Nathanial is using the quadratic formula to solve 0=x^2+5x-6. His steps are shown below. What are the solutions to the equation?

A truck is rented at $40 per day plus a charge per mile of use. The truck traveled 15 miles in one day, and the total was $115.

Factorise fully 8x^2+6x

The school carnival is divided into sections. The tanks are in 1/10 of the carnival. Games are in 4/10 of the carnival. Student exhibits are in 5/10 of the carnival.

9) A health insurance policy costs $700 per year. plus $15 for each visit to the doctor's office. A different plan costs $560 per year, but each office visit is $50. Find the number of office visits for which the two plans have the same total cost.