Slope of 4 means you add 4 to the y and 1 to the x so the answer is (-1,9)
The formula for a quadratic function is y=ax^2+bx+c.
The vertex is h, k. This can be found by evaluating y to get k, and dividung -b by a in order to get h.
Hope this helps!
If the total for the bill was the 284 written in then this is the answer as follows
284*0.25=71
Tip = $71.00
