If x=√7+√6/√7-√6 then find the value of (x+1/x)2

The function f(x) is shown in this graph the function g(x)=6x

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad

Which statement about 6x2 + 7x – 10 is true?