How does the human body naturally create negative ions?

A rectangle has an area of 30 square meter and a perimeter of 34 meters. what are the dimensions of the rectangle

Find the necessary sample size. Scores on a certain test are normally distributed with a variance of 68. A researcher wishes to estimate the mean score achieved by all adults on the test.

What is 7 divided by 2/3?

Jacob has a box of 2 hundred cubes he also has a bag of 40 cubes. how many trains of 10 cubes can hw make?

Solve for b. r = (b-a) m

Solve the following equations: 2/3 (6x+9) = - 2 (1/2x+4) -3 (2y-1) = 4 (1/2y+3/4)

What are the solutions to the system of equations?

Name a real life a example of using negative numbers

Kim spent 70% of her salary on expenses and saved $1200 what is her salary

Trail mix is sold in 1-pound bags. mary will buy some trail mix and repacked it so that each of the 15 members of her hiking club gets one 2/5 pound bag. how many one pound trail mix should marry buy to have enough trail mix without leftovers?