This one is difficult

The volume of the cone is

V=Sb×h/3=(pi×r²)×h/3=(pi×d²/4)×h/3=pi×d²×h/12

where Sb is the area of the base (circle of diameter d and radius r) and h is the height.

Remember d=2r, or r=d/2.

V=pi×12²×9/12=pi×12×9=108×3.14= 339.12cm³.

Rounded to the first tenth: 339.1cm³

answer: first option: 339.1cm³

168

step-by-step explanation:

first off, we know that he drove 3.5 hours at a rate of 48 mph.

knowing that, we want to see how many miles he drove all-together.

in this case, we can just multiply 48 by 3.5.

48 * 3.5 = 168