No explanation needed thank you

The ph level of a blueberry is 3.1 what is the hydrogen-ion concentration [h+] for the blueberry

Ellen makes and sells bookmarks. she graphs the number of bookmarks sold compared to the total money earned. why is the rate of change for the function graphed to the left?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.