The cost of maintaining a water reservoir is c(W)=80 square root w hundred dollars, where w is the depth of the water in the reservoir (in feet). The depth of the water changes with the monthly rainfall. When monthly rainfall is 8 inches per month, the depth of the water is increasing by 1.75 feet per month. How fast is the cost increasing when monthly rainfall is 8 inches and the depth of the water is 5 feet? (Answers are rounded to the nearest hundred dollar.)

Which statement about the relative areas of triangle abd and triangle xyz is true

Solve the problem by making up an equation. a child is 12 years old, and his father is 32 years older. in how many years will the age of the father be 3 times the age of the child?

Jeffery conducted a survey in his school and found that 30 of the 50 eighth grade students' favorite subject is mathematics. based on the results, jeffery concluded that out of the 200 students in his school, 120 students' favorite subject is mathematics. select the statement that is true about jeffery's conclusion. a. jeffery's conclusion is not valid because the sample was biased since only 200 students were surveyed. b. jeffery's conclusion is valid because the sample was random since all of the students were eighth grade students. c. jeffery's conclusion is valid because the sample was random. d. jeffery's conclusion is not valid because the sample was biased since all of the students were eighth grade students.