U just have to find original amount (100%) and that is the amount he made last week.

integrate to get
![[ln|t|]^{3x}_x=ln|3x|-ln|x|=ln| \frac{3x}{x}| =ln |3|=ln(3)](https://tex.z-dn.net/?f=%5Bln%7Ct%7C%5D%5E%7B3x%7D_x%3Dln%7C3x%7C-ln%7Cx%7C%3Dln%7C%20%5Cfrac%7B3x%7D%7Bx%7D%7C%20%3Dln%20%7C3%7C%3Dln%283%29)
this only is true when x>0
when x turns negative, we get -ln(3) because of math
Answer: 50% chance that a randomly chosen student will be a boy
Answer: You can buy 5 cans of tennis balls.
Step-by-step explanation: 100 minus 80 is 20 and that leaves $20 for tennis balls, so 20 divided by 4 is 5 and that's how many cans you can buy.
Jane is 12 years old and Harvey is 36.