find the length of the third side. if necessary, round to the nearest tenth. 12 5

I don’t know how to answer these questions

I need help on this question can you help me thank you

Matt says that he can find the volume of the entire fighire by multipling 3x5x6

a bag contains 40 slips of paper numbered 1-40. if one is randomly chosen, what is the probability of not choosing a multiple of 3 (give each answer as a fraction in simplest form)