Monica is a lawyer who earns $8,322.65 every month. she spends $830.98 on rent, $210.36 on food, and $120.45 on gas every month. after these expenses, she has $ left from her earnings.

a.1.161.79
b.5,999.07
c.7,160.86
d.7,822.48

Bismuth-210 is an isotope that radioactively decays by about 13% each day, meaning 13% of the remaining bismuth-210 transforms into another atom (polonium-210 in this case) each day. if you begin with 233 mg of bismuth-210, how much remains after 8 days?

The weights of players in a basketball league are distributed normally. the distance (d) of each player's weight (w) from the mean of 86 kilograms was computed as follows: d = |w - 86| if d is greater than 7 for approximately 5% of the players, what is the approximate standard deviation of the players' weights? a. 1.75 kilograms b. 3.5 kilograms c. 4.3 kilograms d. 7 kilograms

We just started the introduction into circles and i have no idea how to do this.