Help please im new and i need help

What is the sum of these mixed numbers 2 1/8 + 4 3/8

The probability that an adult possesses a credit card is .70. a researcher selects two adults at random. by assuming the independence, the probability that the first adult possesses a credit card and the second adult does not possess a credit card is:

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x