What is the common difference for this arithmetic sequence? -6, -2, 2, 6, 10, ...
A. 3
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B. 6
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C. 4
D. 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?

Is a positive integer raised to a negative power always positive

It says factor each expression 49x-28?