In square $abcd$, $e$ is the midpoint of $\overline{bc}$, and $f$ is the midpoint of $\overline{cd}$. let $g$ be the intersection of $\overline{ae}$ and $\overline{bf}$. prove that $dg = ab$.

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

The? half-life of a radioactive substance is 20 years. if you start with some amount of this? substance, what fraction will remain in 120 ? years

Of the 27 players trying out for the school basketball team, 8 are more than 6 feet tall and 7 have good aim. what is the probability that the coach would randomly pick a player over 6 feet tall or a player with a good aim? assume that no players over 6 feet tall have good aim. a. b. c. d.