anonymous
  • anonymous
Someone please please help me with these last five problems..
Mathematics
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anonymous
  • anonymous
Someone please please help me with these last five problems..
Mathematics
schrodinger
  • schrodinger
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
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anonymous
  • anonymous
the first one find the surface area and volume of a larger solid. and the other 2 pictures for all four, find the surface area and volume of a larger solid.
anonymous
  • anonymous
In each one solve for the surface area or volume of the object - ex. for your first one the surface area is 48*pi right? The surface area of a cylinder is 2*pi*r*h=48*pi. Now replace each of the dimensions by the scaling factor times itself --> r=2/3r and h=2/3h. Then all you need to do is rearrange until you get the original (2*pi*r*h) equation back and the right side is the answer.
anonymous
  • anonymous
Whoa oops that's wrong, you need to add the top and bottom of the cylinder as well. So 2*pi*r*h+2*pi*r^2. Same from there on though.

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anonymous
  • anonymous
for the first pic. i got the SA=108pi cm^2 and volume 1215pi/8 cm^3
anonymous
  • anonymous
SA is right you should check your second though - \[45\pi=\pi*r^2*h=\pi*(2/3)^2*r*2/3*h=2/3^3*\pi*r^2*h\] so then solve to get the original equation back and you get 45*27/8 which is some fraction around 150 I don't have a calculator on me

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