Plz write all the steps

Write the pair of fractions as a pair of fractions with a common denominator

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:

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.