Find the volume of the pyramid and round to the nearest tenth.
9 cm
5 cm
5 cm

75 cubic cm.

Step-by-step explanation:

5·9=45    - Find the base

45·5=225      - Multiply the base by height

225÷3=75        - Divide the total by 3

75 is the answer

a and c

for infinitely many solutions we require both left and right sides to be equal

distribute and simplify

a

14 - 8x = 20 - 8x - 6 = 14 - 8x ← both sides equal so infinite solutions

b

6x - 54 = 6x - 54 + x = 7x - 54 ← not equal

c

4x + 16 = 4x + 10 + 6 = 4x + 16 ← both sides equal so infinite solutions

d

5x - 40 + 10 = 5x + 10

5x - 30 = 5x + 10 ← not equal