Mary, chau, and david have a total of $87 i their wallets. marry has 9$ more than chau. david has two times what mary has. how much do they have in each wallet?

Answer asap ! the shortest path from point a to point b goes through a pond. to avoid the pond, you must walk straight 34 meters along one edge of the pond, then take a 90 degree turn, and again walk straight 41 meters along another edge of the pond to reach point b. about how many meters would be saved if it were possible to walk through the pond? a. 11 m b. 20 m c. 30.45 m d. 21.73 m

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0

How many terms does the polynomial x^2 y^2 have