A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 one year ago
The perimeter of a semicircle is doubled when the radius is increased by 3. Find the radius of the semicircle.
anonymous
 one year ago
The perimeter of a semicircle is doubled when the radius is increased by 3. Find the radius of the semicircle.

This Question is Open

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2perimeter of a semicircle is r*pi + 2r so the old perimeter is r*pi + 2r and the new perimeter is (r+3)*pi + 2(r+3) we know that the new perimeter is twice the old perimeter so: 2*(r*pi + 2r) = (r+3)*pi + 2(r+3) solve for r

madhu.mukherjee.946
 one year ago
Best ResponseYou've already chosen the best response.0did you understand

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[2(\pi r+2r)=(r+3)\pi +2(r+3)\] does it look like this

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2yes, do you know where to go from there?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0\[\pi r =3\pi  2r+6\] i end up to this :(

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2hmm let's take it from the top 2*(r*pi + 2r) = (r+3)*pi + 2(r+3) 2*r*pi + 4r = pi*r + 3*pi + 2r + 6 pi*r + 2r = 3*pi + 6 we can factor r on the left side, and 3 on the right side giving us: r(pi+2) = 3(pi + 2) then we divide both sides by (pi + 2) r = 3 is that clear?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0oh, i did not factor... thanks. its now clear to me

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0uhmmmm can i ask 5 more problems?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0Joy is an instructional assistant in one of the college labs. She is on a very tight budget. She loves Jamaican Blue Mountain coffee, but it costs $15 a pound. She decides to blend this with regular coffee beans that costs $1.67 a pound. If she spends $14.25 on 3 pounds of coffee, how many pounds of each did she purchase? Round your answers to two decimal places.

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2let's let b = number of pounds of blue mountain and r = regular r + b = 3 since there are 3 pounds of coffee 15b + 1.67r = 14.25 know where to go from there?

Vocaloid
 one year ago
Best ResponseYou've already chosen the best response.2ok, that's fine, no need to apologize we have 2 equations that will help us find what r and b are r + b = 3 15b + 1.67r = 14.25 we can multiply the first equation by (15), giving us 15r  15b = 45 now we can put the two equations together again 15r  15b = 45 15b + 1.67r = 14.25 now we can add the two equations together 15r + 1.67r  15b + 15b = 45 + 14.25 solve for r

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i got 2.31 for r. that is for the regular? what about the pounds of jamaican blue mountain coffee?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0i'll multiply r+b=3 to 1.67?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0thanks!!! i got it right... thanks a lot! :)))

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0A patient requires an IV of 0.9% saline solution, also known as normal saline solution. How much distilled water, to the nearest milliliter, must be added to 100 milliliters of a 6 % saline solution to produce normal saline?
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.