Three siblings- kate, sarah, and dave comitted themselves to volunteer 160 hours for a homeless charity to build new housing. dave worked 15 hours more than kate. sarah worked 20 hours fewer than kate. how many hours did each of these siblings volunteer?

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.

Find the area of the unshaded square

Segment an is an altitude of right δabc with a right angle at a. if ab = 2, squared 5 in and nc = 1 in, find bn, an, ac.