Which equation best represents the model?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.

The oates family went out for dinner the price of the meal was $33.95 the sales tax was 7.25% of the price of the meal . the tip was 15% of the meal and the sales tax . how much money did the oates family pay for the meal, including tax and tip