Answer: (you can solve it using vertical angles, supplementary angles, and same side interior angles)
Y=-2 over 3 -5x ? Here for the answer
The summation symbol means we use the variable i in the equation from the given range. In this case, we are given with the equation 3 i - 15 and i ranges from 2 to 7. The summation using simply the calculator is equal to -9. The answer to this problem is -9.
