Reiko Needs to mail her Christmas cards and packages and wants to keep her mailing costs to no more then $500. The number of cards is at least 4 more than twice the number of packages. The cost of mailing a card (with pictures and closed) is $3 in for a package the cost is $7. Write a system of equations to model the situation​

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

If 3x+8=3x+8 is it one solution or no solution

David leaves his house to go to school. he walks 200 meters west and 300 meters north. how far is david from his original starting point?