Wht is the volume for both 7 and 8 also rounded to nearest tenth if necessary

Volume of a pyramid is V=(AH)/3. A is the area of the base, H is the Height of the pyramid
7) Area of square =side x side
A= 6 x 6
A= 36
V= (36 x 4)/3
V= (144)/3
V= 48
Do the same thing with 8 except the area of a triangle is A=(BH)/2 B is one of the straight sides and H is the other straight side so 7 and 24
A= (7x24)/2
A = (168)/2
A=84
V= (84 x 14)/3
V= 1176/3
v=392