The price of a mat is x USD from the start. Write an expression for the price: a) After it's been reduced by 50%
b) After it's been reduced by 50% twice
c) After first being reduced by 60% and then 40%

(c) a vine called the mile-a-minute weed is known for growing at a very fast rate. it can grow up to 0.5 ft per day. how fast in inches per hour can the mile-a-minute weed grow up to? show your work using the correct conversion factors.