PLZZ SOMONE HELP ASAP I WILL MARK BRIANLST​

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

Alicia puts $400 in a bank account. each year the account earns 5% simple interest. how much money will be in her bank account in six months?

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