(01.07 MC)
The amounts of household waste generated in a region during two years
were 23,400,000 tons and 48,100,000 tons. What was the total
household waste generated over these two years in the region,
expressed in scientific notation?
7.15 - 10x7tons
7.15 - 10x14 tons
71.5 - 10x7 tons
71.5 - 10x14 tons

In simplified exponential notation, the expression a^2•a^-3•a 1/a 0

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.

To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis. how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz