You randomly choose a letter c, replace it, and then choose a letter m. what is the probability of this happening? (the word is summer vacation)

You simply have to count the odds in your favour with each choice, and divide them by the number of all possible cases. Since "SUMMER VACATION" has 14 letters in total, and only one of them is a C, you have 1 chance in 14 of picking a C, or if you prefer

Similarly, 2 of the 14 letters are M, so this time your chances are a bit higher:

$650 per month plus utilities

step-by-step explanation:

just based on the info you gave, it would seem more cost effective to rent at $650 per month plus utilities.   if utilities are, in fact, $150 per month, your monthly living costs would be $800 as opposed to the other option of $825.