Look at the diagram below it represents a 6 by 6 foot board a point at random children from for 20 times ​

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

Dylan and dusty plan to take weekly surfing lessons together. if the 2-hour lessons are $20 per person and they plan to spend $100 each on new surfboards, what is the maximum number of lessons the two can take if the total amount spent for lessons and surfboards is at most $480?

Just tell me how to set up the equation.