Asystem of equations is shown below: equation a: 4c = d – 8 equation b: c = 5d + 8 which of the following steps should be performed to eliminate variable d first?

a. multiply equation b by 4.
b. multiply equation a by –5.
c. multiply equation a by 4.
d. multiply equation b by 5.

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?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days

Does the point (1, sqrt 7) lie on circle shown.