Which planet is the most massive? a. jupiter b. mercury c. venus d. neptune

The answer for #3 is c but i don't know why

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

Aroller coaster is traveling at 13 mi./s when you purchase a hill that is 400 m long and down the hill exonerate at 4.0 m/s squared what is the final velocity of the posterior found your answer to the nearest number