Jeremy purchased a new cellphone on sale 15% for $339.99. What was the original price of the cellphone?

Can someone me and do the problem plz so i can understand it more better

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

Me find the value of x each figure.