Suppose a heat exchanger costs $1200 and reduces the heating bill by $200 per year what is the payback time?

Evaluate the expression 9 - z when z=8

Kiaraly answered 27 out of 30 questions correctly on her math test. Later she answered 22 of 25 questions correctly on her science test. On which did she score higher.

Antionio created a scale drawing for his garden. He used a scale of 1 cm to 1 m. This scale expressed without units would be what?

Izzy wants to raise money for new equipment by selling t - shirts. He pays $5.30 for each T-shirt and needs to raise $465 above the total cost of the T'shirt.

Someone tell me if these sequences are arithmetic, geometric, or neither 1. 2, 7, 27, 107 ... 2. 16, 4, 1, 1/4 ... 3. 71, 62, 53, 44, 35 ...

Which equations model this problem? A recipe that makes 1 serving calls for 0.25 L milk. How many servings can Rohit make if he uses 2 L of milk? Use s for the number of servings. Choose all answers that are correct. A. 0.25: 2=s B. 0.25·s=2 C. 2:0.

What is the value of y that makes the equation y+2.9=11 true?

Thomas earns x dollars each week walking his neighbor's dog. He also earns $10 allowance each week. Which expression represents the amount of money Thomas has earned after 4 weeks? Select each correct answer.

Suppose the skaters complete one lap around a park that has the shape of a regular pentagon what is the sum of the angles through which they turn

A class consists of 12 students (six boys and six girls) and one teacher. In how many ways can the students sit in a circle?