Keep getting this wrong please help

Often on a topographic map, every fifth contour line is darkened. what is this line called? a. key b.slope c.benchmark d. index contour

In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2

Rank substituents in order of their priority when assigning the e or z label to an alkene. i, ch2i , h, ch2ch2cl, f