The pH scale for acidity is defined by pH = − log 10 [ H + ] where [ H + ] is the concentration of hydrogen ions measured in moles per liter (M). (A) The pH of pure water is 7.0. Calculate the concentration of hydrogen ions in moles per liter (M).
(B) The pH of rain water is 5.5. Calculate the concentration of hydrogen ions in moles per liter (M).

John bought 5 lemons and used 2 of them for a salad how much did he use for. a salad . he used % of the lemons.

The label on the car's antifreeze container claims to protect the car between ? 40°c and 125°c. to convert celsius temperature to fahrenheit temperature, the formula is c = 5 over 9 (f ? 32). write and solve the inequality to determine the fahrenheit temperature range at which this antifreeze protects the car. ? 40 > 5 over 9 (f ? 32) > 125; ? 40 > f > 257 ? 40 < 5 over 9 (f ? 32) < 125; ? 40 < f < 257 ? 40 < 5 over 9 (f ? 32); ? 40 < f 5 over 9 (f ? 32) < 125; f < 257

Find cot x if sin x cot x csc x = √2