Billy has 80 marbles in his collection.
There are 16 ounces in a pound so we can form a equation 20 x 16 = 320
Then, we do 320 divided by 4 which gives us the figure 80. Hope this has helped you.
Answer:

Step-by-step explanation:
Given

Required
Simplify the given expression

Start by applying law of indices


Divide numerator and denominator by 5

Hence; the expression is equivalent to 
Answer:
C. 10
Step-by-step explanation:
The given information tells you that triangles YZX and YZA are congruent, so ZA = ZX = 10.
Answer:
15
Step-by-step explanation: