Can anyone help me please

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12

If value of cos330° is √3/2 then find tan165°.

The weight of a radioactive isotope was 96 grams at the start of an experiment. after one hour, the weight of the isotope was half of its initial weight. after two hours, the weight of the isotope was half of its weight the previous hour. if this pattern continues, which of the following graphs represents the weight of the radioactive isotope over time? a. graph w b. graph x c. graph y d. graph z