9.95 , rounded to the nearest hundredths :)
I believe it is c I am not 100 percent tho
To solve for the variable "w" you only need to use algebra to get it alone on one side of the equals sign.
472 to the nearest 100 is 500
Mary has 4 marbles because Joan has 100 marbles and he has 25 times as many marbles as Mary so we divide :)