Given the sequence 1,9,25,49,81 find the explicit formula

What is the vertex form of f(x) = x2 + 6x + 3

Lindsay used two points, (x, y; ) and (+2.82), to find the equation of the line, y = mx + b, that passes through the points. y2-y, first, she used the definition of slope and determined that the value of mis x, - . given this information, which expression must represent the value of b?

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?