Are a parallelogram and a pentagon always sometimes or never similar

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

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?

Aaron paid $9.75 for markers that cost $0.75 each. he bought 4 times as many pencils for $0.35 each. how much did aaron pay for pencils?