What is the vertex of the quadratic function y=x^2+10x-3

If the measure of xyz is 81 what is the measure of yz

Tom wants to order tickets online so that he and three of his friends can go to a water park the cost of the tickets is 16.00 per person there is also a 2.50 one-time service fee for ordering tickets online write an expression in term of n that represents the cost for n ordering tickets online

What is the value of x in the equation 2(x-4) = 4(2x + 1)?