Please help with chemistry questions! And can you explain work?

Convert 32.8lb to g (1lb = 453.6g)

A. 7.23e-2g

B. 1.49e3g

C. 7.23e4g

D. 1.49e4g

E. 1.49e2g

Convert 0.052ft^3 to L (2.54cm=1 in, 1L = 1dm^3

A. 1.8e-3L

B. 1.5L

C. 15L

D. 1.6e-3L

E. 1.7L

How many significant numbers in 0.0006042

A. 8 B. 7 C. 4 D. 0 E. 3

Express the volume 321.0cm^3 in liters

A. 0.03210L B. 0.3210L C. 32.10L D. 3.210L E. 321.0L

The calibration points for the linear Peaumur scale are the usual melting point of ice and boiling points of water,which are assigned the values 0 degree R and 80 degree R respectively. The normal body temp of a human is 98.6*F..what is the temp in *R?

A. 28.0 B. 37.0 C. 29.0 D. none of these E. 29.6