Okay so i already answered this question a. what is the density of an 84.7g sample of an unknown substance if the sample occupies 49.6cm^3? but question b. stumped me so question b. is what volume would be occupied by 7.75g of this same substance?

The density of the substance is obtained by dividing its mass by its volume. Density is an intensive property which means that its value does not depend on the amount of substance and will always stay the same for same conditions.  
                                   d = 84.7 g / 46.7 cm³ = 7.75 g / x cm³
The value of x is approximately 4.27 cm³.

To a fellow spongebob-ian i will be glad to , the cheetah didn't get far on purpose because he's a cheetah  ( ͡° ͜ʖ ͡°)