45 songs. if you bought 15 videos that would be 15x3=45. 90-45=45. leaving you $45 to buy songs
(3 3/4)/(1/8) rule: a b/c=(ac+b)/c
(15/4)/(1/8) rule (a/b)/(c/d)=(a/b)*(d/c)
(15/4)(8/1)
120/4 simplify by dividing numerator and denominator by 4
30
So with 3 3/4 pounds of dough, she can make 30 rolls.
Answer:
or 
Step-by-step explanation:
The volume of a cylinder can be found with the following formula:

Where "r" is the radius and "h" is the height of the cylinder.
In this case, let be:
-
the volume of one of this cylinders and
the volume of the other one.
-
the radius of the first one and
the radius of the other cylinder.
-
the height of one of them and
the height of the other cylinder.
Then:

Therefore, you know this:

Simplifying, you get:

Now, knowing the ratios given in the exercise, you can substitute them into the equation:

Evaluating, you get:

Answer:
18cm
Step-by-step explanation:
presents=x
14cm=7x
divide by 7
2=x
find 9x
9*2=18