For the following situations write a formula that gives the value of the investment, C , in terms of the number of years since the investment was made, x .

The investment started with $900 and increased by $25 each year.

The investment started with $1400 and increases by 1.17% each year.

The investment started with $500 and decreases by 1.14% each year.

The investment started with $1000 and decreases by $56 each year.

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.

Is the square root of 4 plus the square root of 16 rational?

Christina can paint 420 square feet in 105 minutes. which unit rate describes the scenario?