25 to 3.75 what is percent change to the nearest tenth

What is the percent of increase for a population that changed from 438,000 to 561,000

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct