Answer:
The list already says the diameter. Here's the answers for the other stuff though:
A≈201.06
A≈4417.86
7(3a + 12) = 168 ← ( divide both sides by 7 )
3a + 12 = 24 ← ( subtract 12 from both sides )
3a = 12 ← ( divide both sides by 3 )
a = 4
OR
distribute the parenthesis by 7
21a + 84 = 168 ← ( subtract 84 from both sides )
21a = 84 ← ( divide both sides by 21 )
a = 4
Answer:
39.25 cubic feet of paint will be needed by Ellis.
Step-by-step explanation:
Volume of a cylinder:
The volume of a cylinder of radius r and height h is given by:
How much paint will Ellis need to paint all the surfaces of the 10 fenceposts?
This is the combined volume of these 10 fenceposts.
They are each 5 feet tall and have a diameter of 1 foot.
Radius is half the diameter, so . Also
10 fenceposts:
Each has the same volume, so:
39.25 cubic feet of paint will be needed by Ellis.
I'm pretty sure u have to make the denominators the same by finding the LCM (least common multiple). so 3/5 would be 9/15 cuz u have to change the numerator by the denominator. so five times three, three times three. so 9/15 and do the same for the other one. 1/3 equals 5/15. sorry i'm not a teacher but i hope i helped. oh and remember to rebel against favoritism in schools and at home.