I believe its answer is D.
A function is a relation from a set of possible outputs where each input is related to exactly one output. I how this is what you're looking for.
(It might also have helped immensely if you had been listening
when this was being explained in class.)
The first pipe fills 1/20 of the tank each minute.
The second pipe fills 1/30 of the tank each minute.
Operating together, the two pipes fill ( 1/20 + 1/30 ) of the tank each minute.
In order to add these fractions (or any fractions), you need a common denominator.
For these particular ones, ' 60 ' is a good choice.
( 1/20 + 1/30 ) = ( 3/60 + 2/60) = 5/60 = 1/12
The rate of work is 1/12 tankful per minute .
The most sensible choice for the time is 12 minutes.
R x T = W
( 1/12 tankful per minute ) x ( 12 minutes ) = 1 full tank
1. 1/3 to get a red ball.
2. 4/13 to get a blue ball.
3. 3/7 to get a green ball.
Hope this helps!
a. I would assume that you would name the circle B since it is the midpoint.
b. A radius would be BE since it is halfway through the circle.
c. A diameter would be AD since it goes through the entire circle.
d. Another diameter would be FE since it, once again, goes through the entire circle.
do not know because my brain cant focus on this sorry :/
