Clara forgot to distribute the - sign to- (2b-r) through all the terms the answer would be 6b+3r
Answer:
a
Step-by-step explanation:
The third angle is 60 degrees. A triangle has 180 degrees so 180-30-90=60
A
The volume (V) of a pyramid is found using the formula
V =
× area of base × height(h)
area of base = 9² = 81 ← area of a square, hence
324 =
× 81 × h = 27h ( divide both sides by 27 )
h =
= 12 → A