The 9-1-1 service fee on telecommunications bills is what type of tax? select all that apply
service tax
professional service tax
ad valorem tax
fixed tax
business tax

If 20% of a number is 35, what is 50% of that number?

In the polynomial below, what number should replace the question mark to produce a difference of squares? x2 + ? x - 36

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?