Which term of series1 +4+7+10+...is43

Can someone answer this question? : )

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

Given ab and cb are tangents of p, and m =10°. what is the measure of abp?