20 pounds of a dry powder drug with a 50% concentration needs to be mixed with how many pounds of the dry powder drug with a 30% concentration to get a 40% concentrated solution?

Part a: select all of the ordered pairs that are located on the graph of the equation. part b: does the graph of the equation represent a function? select all correct answers for part a and one answer for part b.

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount