What is the simplest form for 4/10

If i have 20$ and i gave 5$ away how much i got

The frequency table shows the results of a survey comparing the number of beach towels sold for full price and at a discount during each of the three summer months. the store owner converts the frequency table to a conditional relative frequency table by row. which value should he use for x? round to the nearest hundredth. 0.89 0.90 0.92 0.96

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1