Lisa's Coffee Shop makes a blend that is a mixture of two types of coffee. Type A coffee costs Lisa $5.80 per pound, and type B coffee costs $4.45 per pound. This month, Lisa made 145 pounds of the blend, for a total cost of $765.40. How many pounds of type A coffee did she use?

The number of chocolate chips in an 18-ounce bag of chocolate chip cookies is approximately normally distributed with a mean of 1252 chips and standard deviation 129 chips. (a) what is the probability that a randomly selected bag contains between 1100 and 1500 chocolate chips, inclusive? (b) what is the probability that a randomly selected bag contains fewer than 1125 chocolate chips? (c) what proportion of bags contains more than 1225 chocolate chips? (d) what is the percentile rank of a bag that contains 1425 chocolate chips?

Complex numbers multiply √-4 * √-25 and show all intermediate steps. alternative notation is sqrt(-4) * sqrt(-25).

The measure of angle 0 is 600 degrees