Please help me I will give you extra points and whoever the first one to answer I mark you with the brain thing.

The area of square garden is 300m squared. how long is the diagonal?

Twelve less than a number is at most 20

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