3. A pharmacist needs a blend of chemical containing 35% of manganese but she has one vial at 40% and another at 25%. How many of each must be mixed to provide 100 pounds of
35% manganese?

How many days was the temperature above 90 degrees?

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?

Find the value of x. also give me an explanation so i can complete it to other questions as well, : )