Can someone please help me with this??? I'm so confused

What is the value of the expression [(5)(9) / x] + 6 when x = 3?
a. 5
b. 15
c. 18
d. 21

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

Arrange these numbers from least to greatest 3/5 5/7 2/9

Question part points submissions used suppose that 100 lottery tickets are given out in sequence to the first 100 guests to arrive at a party. of these 100 tickets, only 12 are winning tickets. the generalized pigeonhole principle guarantees that there must be a streak of at least l losing tickets in a row. find l.