Answer:
Step-by-step explanation:
399*42%= 167.58 the mark up amount
399+167.50=566.50 total
Solve the system using substitutions:

x has a value of 1. Use this value to find the value of y.

y has a value of 1.
x=1
y=1
Answer:
16
Step-by-step explanation:
40 can be multiplied by 5, 8 times. 8 multiplied by 2 is 16.
Answer:
The average distance between Earth and Pluto is same as average distance of Pluto from the Sun. This is 0.000628 light years, nearly.
Explanation:
The average distance obetween two planets is nearly the average distance of the outer planet from the Sun. Earth is inner to Pluto. Average Sun-Pluto distance = 5906.4 million km. Divide by 149597870 to get distance in Au. Further divide by 62900 to get distance in ly.
30.6 because 10.2 times 30 is 30.6