[-½, ¾]; use either "Substitution" or "Elimination" to do this, and you'll see that this answer is correct.
Answer:

Step-by-step explanation:
Let x = unknown number


Multiply both sides by 9:

Expand brackets:

Add 32 to both sides:

Divide both sides by 8:

In the room where you're sitting right now, the angle on the floor
where the bottoms of two walls come together is 90 degrees.
Answer:
756π cm^3.
Step-by-step explanation:
Volume of the cone
270π = 1/3 π r^2 h
270π = 1/3 π r^2 * 10
r^2 = 270 / ( 10/3 )
r^2 = 81
r = 9 cm.
So the volume of the hemisphere = 1/2 * 4/3 * π * 9^3
= 486π cm^3.
So the volume of the whole solid = 270π + 486π
= 756 π cm^3.