Some companies who make those annoying phone calls to try to sell you something generate the phone numbers randomly. Given that ten-digit phone numbers NNN-NNN- can't have a 0, 1, or 9 as the first digit nor can it have 1 or 9 as the second digit. How many different phone numbers are possible?

(least common multiples) the answer that i had in the 1st step was lcm of airline tickets sold=72. idk if that even matters but just in case. ! three co-workers are busy selling airline tickets over the phone. in an 8-hour day, charles can sell 8 airline tickets, ann can sell 9 airline tickets, and michelle can sell 6 airline tickets. step 2 of 2: what is the smallest number of 8-hour days needed for each of them to achieve the same number of sales? it takes charles . it takes . it takes .

Which of the following parabolas opens down?

10x − 5y + 14 = 0 whats the answer pls