I need help asap

Solve for k

1/3(k-9)=1/3k+1/3

Thank you :)

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

Write an equation of the line that passes through 9,2 and is parallel to the line y=5/3x+9