An experiment consists of drawing a marble out of a bag, observing the color, and then placing it back in
the bag. Suppose the experiment is repeated 75 times, with the following results:
red 38
blue 23
green 11
yellow 3
What is the probability of drawing two yellow marbles in a row?
a. 0.00016
C. 0.016
b. 0.0016
d. 0.16

In trapezoid efgh, m∠hef=(4x2+16)∘ and m∠gfe=(5x2+12)∘. find the value of x so that efgh is isosceles. i'm desperate.

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.