Write an equation to find the number of Mr. night's homeroom if the total number of students is 90

A brand of cereal had 1.2 mg of iron per serving. Then they changed their recipe so they had 1.8 mg of iron per serving. What was the percent increase in iron?

Ann purchased 6 packs of red pens, 10 pack of blue pens, and 8 pack of black pens. If there are 15 pens in each pack, how many pens did Ann purchased altogether

Berta is planning a party for her friends. The room rental cost is $50 plus an additional $3 per person to cover food costs. Berta has saved up $100 dollars.

What is the least common multiple of the denominators for the two fractions 1/6 and 5/8?

Sarah lost 12 pounds over the summer by jogging each week. By winter time, she had gained 4 3/8 pounds. Represent this situation with an expression involving signed numbers. What is the overall change in Sara's weight.

At a refinery, there are two loading docks. The first dock is for ships with a capacity of more than 300,000 gallons. The second dock is for ships with a capacity smaller than 300,000 gallons. The table shows the capacity of four ships in liters.

A certain forest covers an area of 3800 km^2. Suppose that each year this area decreases by 7.25%. What will the area be after 5 years

Can negative numbers be integers?

The owner of a large manufacturing plant pays the base rate of $11.24 per $100 in wages paid for workers' compensation insurance. The payroll for September is $179,805. What is the month's premium for the workers' compensation insurance? A $20, 210.

Write 129.701 in expanded form