17. the total weight of a rock depends on its size and is proportional to its density. in this context, density is the weight per cubic inch. let w denote the weight of the rock in pounds, s the size of the rock in cubic inches, and d the density of the rock in pounds per cubic inch. if a 48-cubic-inch rock weighs w pounds, write an equation that shows the proportionality relation. a. d 48 w b. dw+48 48 c. d w 48 d. d 10w 48