One day, the temperature started at 18° at 6: 00 a. m., then climbed 7° by noon, and then dropped 5° by midnight. what was the temperature at midnight?

14 degrees

4 degrees

10 degrees

20 degrees

2x - 20 = 32 20 - 3x = 8 6x - 8 = 16 -13 - 3x = -10

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?

Use sigma notation to represent the following series for 9 terms.