A child has fewer than 40 baseball cards. If he puts them in piles of 2, 4, 8, or 12 he has one card left over each time. How many baseball cards does he have?

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

Acar loses a quarter of its value every year. it is originally worth $35,000. to the nearest dollar,how much will the car be worth in 8 years?

The half-life of a certain material is 0.004 second. approximately how much of a 20-gram sample will be left after 0.016 second? a. 5 grams b. 16 grams c. 0.32 gram d. 1.25 grams