A submarine is 105 feet below the surface of the water . And it begins to ascend at a rate of 3 feet per minute. After how many minutes will the submarine be 81 feet below the surface.(explain with right answer )

An optical inspection system is used to distinguish among different part types. the probability of a correct classification of any part is 0.92. suppose that three parts are inspected and that the classifications are independent. let the random variable x denote the number of parts that are correctly classified. determine the probability mass function of x. round your answers to four decimal places (e.g. 98.7654). x f(x) 0 1 2 3

Which of the following is the explicit rule for a geometric sequence defined a recursive formula of a -5a for which the first term is 23?

Me. i can't figure out this question. give an explanation too. .