Answer:
Volume of the rock=
Step-by-step explanation:
Volume of triangular pyramid = 
Where B is the area of base
H is the height of pyramid
Length if base of base triangle = 8.5 inches
Height of base = 4 inches
Area of base triangle = 
Height of pyramid = 12 inches
Volume of triangular pyramid = 
So, option D is true
Volume of the rock=
Answer:
Option A
Step-by-step explanation:
Convert mixed fraction to improper fraction.

Now isolate 'w'

Answer:
7x+12 because there is 8x then you subtract 1x which 'll equal 7x and add the 12
Answer:
4x² + 4x + 5
Step-by-step explanation:
Note that (f - g)(x) = f(x) - g(x), thus
f(x) - g(x)
= 5x² - 3 - (x² - 4x - 8 ) ← distribute parenthesis by - 1
= 5x² - 3 - x² + 4x + 8 ← collect like terms
= 4x² + 4x + 5