In an arithmetic series
If a1=855 and a20=760 find s20

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)

Using graph paper, determine the line described by the given point and slope. click to show the correct graph below.(0, 0) and 2/3