Help me plz its urgent

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

Solve with work both bert and ernie received an increase in their weekly salaries. bert's salary increased from $520 to $520. ernie's salary went from $580 to $645. find the percent of increase for each salary. what was the larger of the two percents ?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)