Does anyone wanna go on zooom?

What percent of the circle below is shaded?

Aline passes through 3,7 and 6,9 what equation represents the line

F. a fair coin is thrown in the air four times. if the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss? a. 0 b. 1/16 c. 1/8 d. 1/2