Me out!

which of the following is a technique used in relative dating?
select one:
a. beta decay
b. index fossil correlation
c. isotope ratios

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

Fill in the coefficients that will balance the following reaction: a0cr2(so4)3 + a1agno3

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.