7 divided by 2, plus the product of -4 and a number s

Which graph shows a function with a range of all real numbers greater than or equal to -1

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

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?