Answer the question with the equation

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

What is the 9th term in the geometric sequence described by this explicit formula? an=-6. (2)(n-1) apex

Gabriel determined that his total cost would be represented by 2.5x + 2y – 2. his sister states that the expression should be x + x + 0.5x + y + y – 2. who is correct? explain.