The ratio of girls to boys in liza’s classroom is 5 to 4. how many girls are in her classroom if there is a total of 27 students?

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