The first term of an arithmetic sequence is -5, and the tenth term is 13. what is the common difference?
a) 2

b) 1.8

c) 8/9

With #! i’ve tried to figure it out but i can’t.

7x+8y=-18, 4x-9y=-3 solve the system of equations

Sandy is upgrading her internet service. fast internet charges $20 for installation and $52.45 per month. quick internet has free installation but charges $57.45 per month. part 1 out of 2 complete the equation that can be used to find the number of months after which the internet service would cost the same. use the variable x to represent the number of months of internet service purchased.