Results 1 to 3 of 3

Math Help - Can Somebody Check My Work? (Only 5 questions.)

  1. #1
    Newbie
    Joined
    Mar 2014
    From
    Florida
    Posts
    1

    Question Can Somebody Check My Work? (Only 5 questions.)

    I'm quite nervous about this new lesson. Can some one check if these answers are correct?

    1: Find the volume of a cylinder with a diameter of 6 inches and a height that is three times the radius. Use 3.14 for pi and round your answer to the nearest hundredth. (Do not type anything besides numerals and decimals)
    254.46

    2: Given a soda can with a volume of 21 and a diameter of 6, what is the volume of a cone that fits perfectly inside the soda can?
    6.97

    3:
    Given a cube with a volume of 36 cm3, what is the volume of a square pyramid that can fit perfectly inside the cube?
    6 cm

    4:
    Find the circumference and area of a circle with a diameter of 14 inches. Leave your answers in terms of pi.
    C = 14π; A = 49π

    5:
    The stack on the left is made up of 15 pennies, and the stack on the right is also made up of 15 pennies. If the volume of the stack of pennies on the left is 375 mm3, what is the volume of the stack of pennies on the right in cubic millimeters? (Do not type anything besides numerals and decimals)
    375


    That's all. Please let me know how I did!
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    Joined
    Feb 2014
    From
    United States
    Posts
    855
    Thanks
    430

    Re: Can Somebody Check My Work? (Only 5 questions.)

    Quote Originally Posted by quixoticideals View Post
    I'm quite nervous about this new lesson. Can some one check if these answers are correct?

    1: Find the volume of a cylinder with a diameter of 6 inches and a height that is three times the radius. Use 3.14 for pi and round your answer to the nearest hundredth. (Do not type anything besides numerals and decimals)
    254.46 I get a slightly different answer. Please check your arithmetic.

    2: Given a soda can with a volume of 21 and a diameter of 6, what is the volume of a cone that fits perfectly inside the soda can?
    6.97 Again, I get a slightly different answer. How did you arrive at this?

    3:
    Given a cube with a volume of 36 cm3, what is the volume of a square pyramid that can fit perfectly inside the cube?
    6 cm This is wrong? How did you get it?

    4:
    Find the circumference and area of a circle with a diameter of 14 inches. Leave your answers in terms of pi.
    C = 14π; A = 49π Correct

    5:
    The stack on the left is made up of 15 pennies, and the stack on the right is also made up of 15 pennies. If the volume of the stack of pennies on the left is 375 mm3, what is the volume of the stack of pennies on the right in cubic millimeters? (Do not type anything besides numerals and decimals)
    375 This question depends on a picture that we cannot see, but for the life of me I cannot imagine how your answer can be wrong


    That's all. Please let me know how I did!
    Please show your work for the first three problems. We cannot tell you where you may be going wrong if we cannot see what you have done.
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Super Member

    Joined
    May 2006
    From
    Lexington, MA (USA)
    Posts
    11,953
    Thanks
    804

    Re: Can Somebody Check My Work? (Only 5 questions.)

    Hello, quixoticideals!

    1: Find the volume of a cylinder with a diameter of 6 inches and a height that is three times the radius.
    Use 3.14 for pi and round your answer to the nearest hundredth.
    . . 254.46 .?

    V \:=\:\pi r^2h

    We are given: . r = 3,\,h = 9.

    Therefore: .  V \;=\;\pi(3^2)(9) \;=\;81\pi \;\approx\;81(3.14) \;=\;254.34




    2: Given a soda can with a volume of 21 and a diameter of 6,
    what is the volume of a cone that fits perfectly inside the soda can?
    . . 6.97 . ?

    \text{Volume of cylinder: }\:\pi r^2h
    \text{Volume of cone: }\:\tfrac{1}{3}\pi r^2h

    The volume of the cone is one-third the volume of the cylinder.

    Answer: . \tfrac{1}{3}(21) \:=\:7




    3: Given a cube with a volume of 36 cm3,
    what is the volume of a square pyramid that can fit perfectly inside the cube?
    . . 6 cm

    This has similar formula.

    The volume of the pyramid is one-third the volume of the cube.




    4: Find the circumference and area of a circle with a diameter of 14 inches.
    Leave your answers in terms of pi.
    . . C = 14π; A = 49π . Correct!


    5. The stack on the left is made up of 15 pennies,
    and the stack on the right is also made up of 15 pennies.
    If the volume of the stack of pennies on the left is 375 mm3,
    what is the volume of the stack of pennies on the right in cubic millimeters?
    . . 375

    Tell us about the picture.

    Are the two stacks exactly the same height?
    Or is one of them different?
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Replies: 4
    Last Post: March 12th 2011, 05:05 AM
  2. Work--please check my work for me
    Posted in the Calculus Forum
    Replies: 3
    Last Post: February 1st 2011, 10:02 AM
  3. Replies: 1
    Last Post: July 21st 2010, 07:02 PM
  4. Combinatoric Questions - Check Work
    Posted in the Statistics Forum
    Replies: 1
    Last Post: February 23rd 2009, 11:19 PM
  5. Please Check My Work:
    Posted in the Calculus Forum
    Replies: 4
    Last Post: September 15th 2007, 08:05 PM

Search Tags


/mathhelpforum @mathhelpforum