Can some one help me ASAP with the 3rd and 4th answer please! This is due at 7:30 in the morning

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

What type of reaction is shown below? check all that apply. 2h2o2 → 2h2o + o2 synthesis decomposition combustion

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer