PLS HELP NEED RN! WORTH 50 POINTS!!! (only answer if you know BOTH answers.)

What is the length of an with endpoints a 3,2 and b 8,14

Answer this 30 points and brainliest!

Aprojectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. after how many seconds does the projectile take to reach its maximum height?