Which of the following is true regarding the sequence below?
7/12, 1/6, -1/4, 2/3
a. the sequence is arithmetic because there is a common difference of -5/12
b. the sequence is arithmetic because there is a common difference of 1.
c. the sequence is not arithmetic because there is no common difference between the values of n.
d. the sequence is not arithmetic because there is no common difference between the values of a_n.

For each proportion find the unknown number x 1/5/8=×/15

Nine more than four times a number is the same as one less than twice the number. find the number?

Consider a bag that contains 220 coins of which 6 are rare indian pennies. for the given pair of events a and b, complete parts (a) and (b) below. a: when one of the 220 coins is randomly selected, it is one of the 6 indian pennies. b: when another one of the 220 coins is randomly selected (with replacement), it is also one of the 6 indian pennies. a. determine whether events a and b are independent or dependent. b. find p(a and b), the probability that events a and b both occur.