Are these two lines parallel, perpendicular or neither

Acoin is tossed twice. let e e be the event "the first toss shows heads" and f f the event "the second toss shows heads". (a) are the events e e and f f independent? input yes or no here: yes (b) find the probability of showing heads on both toss. input your answer here: preview

36 inches/second = yards/minute how many yards?

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.