PLZ HELP ME ASAP.. Which is the correct algebraic expression after combining like terms?

6 cd+ 3 c- 7 d- 3 cd+ 4d+ 1/3 c
- 3cd+ 2 2/3c - 11d
- 3cd+3 1/3c- 3d
- 9cd+ 2 2/3c- 3d
- 9cd+ 3 1/3c- 3d

The following frequency table relates the weekly sales of bicycles at a given store over a 42-week period. value01234567frequency367108521(a) in how many weeks were at least 2 bikes sold? (b) in how many weeks were at least 5 bikes sold? (c) in how many weeks were an even number of bikes sold?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.

Solve the inequaliy: (x^2+2)(x−2)^2(6−2x)> 0