Find the first term and the common difference of an arithmetic sequence in which the sixth term is -20 and the 28 th term is 156. (use a system of equations)

Through: (-3,-3) parallel to y= 7/3x+3

Find the nonpermissible replacement for binthis expression.b2/5b +5

Atorch and a battery cost 2.50 altogether.the torch costs 1.50 more than the battery.what fraction of the total price is the torch? give your answer in its simplest form.