Select all the correct answers. Which expression can be factored using the difference of squares identity? 6x^2 - 81
49x - x^4
X^4 - 400
32y^2 - 8z^2
4a^2 - 64b^5

The table shows a pattern of exponents. what is the pattern as the exponents decrease?

Exclude leap years from the following calculations. (a) compute the probability that a randomly selected person does not have a birthday on october 4. (type an integer or a decimal rounded to three decimal places as needed.) (b) compute the probability that a randomly selected person does not have a birthday on the 1st day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (c) compute the probability that a randomly selected person does not have a birthday on the 30th day of a month. (type an integer or a decimal rounded to three decimal places as needed.) (d) compute the probability that a randomly selected person was not born in january. (type an integer or a decimal rounded to three decimal places as needed.)

Can anyone explain to me how to do this? anything will .