Suppose each laptop of a certain type is assigned a series number, which consists of a sequence of eight symbols: number, letter, letter, letter, number, number, number, number, where a letter is any one of 26 letters and a number is one among 0, 1, : : : , 9. Assume that all series numbers are equally likely. (a) What is the probability that all symbols are dierent if one laptop is picked at random with equal probability? (b) What is the probability that all symbols are dierent and the rst number is the largest among the numbers?

Michelle and julie work at a catering company. they need to bake 264 cookies for a birthday party that starts in a little over an hour and a half. each tube of cookie dough claims to make 36 cookies, but michelle eats about 1/5 of every tube and julie makes cookies that are 1.5 times as large as the recommended cookie size.it takes about 8 minutes to bake a container of cookies, but since julie's cookies are larger, they take 12 minutes to bake. a. how many tubes should each girl plan to bake? how long does each girl use the oven? b. explain your solution process what did you make? c. what assumptions did you make?

Rationalize the denominator- 12x/√x-10

If a flying disk is 139 meters in the air and travels at an average of 13 m/s how long is it in the air