the cost of a limited edition baseball card increases from $20 to $40. What percent did the price increase by?

The distance around a circle is 56.55 m long. What is the area of the circle?

Jill is training for a marathon and she runs 2 and 1 half miles 3 times a week how far will she run in 6 weeks

The size 4 soccer ball Sean's team uses should weigh no more than 0.37 kilogram, and no less than 0.31 kilogram. A soccer bag has two balls in it. what is the most they could weigh together? The least?

Divide 56 pens into 2 groups so the ratio is 7:8

It takes Kate 10 minutes to walk to the bus stop. How many seconds does it take her to walk to the bus stop

The sum of three numbers is 185 The second number is 5 times the first. The third number is 13 less than the second. What is the second number?

Based on the generalization in (a) , find the sum of the sequence 9+27+45+6 ... + 117

After n years, the amount of money in William's saving account can be modeled by the function s (n) = 300 (1.0016) 12n, and the amount of money hiding in his desk drawer can be modeled by the function d (n) = 75.

Find the supplement of a 55° angle, in degrees.

Thomas rents a car for his vacation. the mileage included with the rental is 54 miles. For every mile he drives over 54 miles, he needs to pay $1 4/5. If he drives 69 miles, how much extra does he need to pay?