Brookehas to set up 70 chairs in equal rose for the class talent show but there is not room for more than 20 rows what are the possible numbers of a rose that brooks could set up

Anyone know? will mark brainliest if correct!

Evaluate this using ! 0.25^2 x 2.4 + 0.25 x 2.4^2 − 0.25 x 2.4 x 0.65

Atrain leaves little? rock, arkansas, and travels north at 90 kilometers per hour. another train leaves at the same time and travels south at 80 kilometers per hour. how long will it take before they are 680 kilometers? apart?