A sinusoidal function repeats itself every 20 seconds, a maximum height of 10 m, and a minimum height of 6 m. At time t=0, the function's height is at its minimum value.

(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 ?

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

Pls never taught i’m really confused and i rlly need