I NEED HELP ASAP Please thanks!! (multiple choice)

1) Which one of the following statements is FALSE?
Select one:
a. Water reaches its maximum density at 4°C.
b. The density of water is temperature dependent.
c. The mass of a sample of water is unchanged when it expands.
d. The density of water is unaffected by minor expansion or contraction.

2) Which statement best describes the data below if the real value is 14.5 m?
i) 14.4 m, ii) 14.5 m, iii) 14.6 m, iv) 14.5 m
Select one:
a. accurate and precise
b. neither accurate nor precise
c. accurate but not precise
d. precise but not accurate

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic 

They are like other investigations? say there was a murder u have to do blood test and finger prints which run through a lab.