Answer:
The answer is she sold 20 labradorite crytals and 3 galena crystals.
Step-by-step explanation:
First you times 20 x 20 and get 400 and then times 13 x 3 and get 39 and 400 plus 39 equals $439.
Answer:
C
Step-by-step explanation:
Since the question is asking for surface area and the dimensions are multiplied by 10, the surface area is multiplied by 10^2, or 100. (For area it would be 10^3, or 1000)
Do you have a calculator? If so, divide the numerator by the denominator. For example... 2/7: take 2 divided by 7 and you get 28.6%
Option a: 
is the solution to the system of equations.
Explanation:
The equations are 
and 
Equating these two equations, we have,
Taking LCM and multiplying both sides by 5, we get,
Simplifying , we get,
Substituting the value of x in , we get,
Thus, the solution is 
Changing the solution from fraction to decimal, we get, 
Thus, the solution is
Hence, option a is the correct answer.
Answer:
x = 27.5
Step-by-step explanation:
You have to add 10.6 on the left to isolate 'x', and in turn you have to do the same to the right side.
Add 10.6 and 16.9
10.6+16.9 = 27.5
:)
