What four things do we want to know about a skeleton?

Given: circle a externally tangent to circle b. how many possible common tangents to circles a and b can exist? 2 3 4

What are the answers for the following questions?

To solve this system of equations by elimination, what operation could be used to eliminate the y-variable and find the value of x? 6x + 5y = 2 4x + 2y = 8 a) subtract 2 times the second equation from 3 times the first equation b) subtract 3 times the second equation from 2 times the first equation c) subtract 5 times the second equation from 2 times the first equation d) subtract 2 times the second equation from 5 times the first equation