Enter the value of x. the diagram is not to scale

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Express -5 2/5 as an improper fraction.

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