Look at the pentagonal numbers. Use finite differences to determine which function represents the pattern.
f(x) = 1.5x - 0.5x
f(x) = 1.5x^2 + 1.5x
f(x) = 1.5x^2 - 0.5v
f(x) = 0.5x^2 + 0.5x

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?

Collin did the work to see if 10 is a solution to the equation r/4=2.4

Which shaded region is the solution to the system of inequalities? y y[tex]\geq[/tex]-x+1