Aperson hour is a unit of measure representing one person working for one hour. a construction foreman estimates it will take 2880 person-hours to build a new library. if 12 workers are scheduled to work on the project at the same time, how many hours will it take to complete the project

Write two subtraction equations that are equivalent to 5 + 12 = 17.

According to the 2008 u.s. census, california had a population of approximately 4 × 10^7 people and florida had a population of approximately 2 × 10^7 people. which of the following is true? a. the population of florida was approximately two times the population of california. b. the population of florida was approximately twenty times the population of california. c. the population of california was approximately twenty times the population of florida. d. the population of california was approximately two times the population of florida.

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?