how many scalene triangles have side lengths that are integers and have a perimeter less than or equal to 12?

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?

Is experimental probibilty the same as the observed frequency in math? i need the answer asap!

Plz : denver is about 5,200 feet above sea level. which number line best represents this integer?