Question: A line segment on a number line has its and points at -9 and six. Answers: A 1.5 B -1.5 C to D -3... I need help

Find the coordinates of the midpoint of line HX given that H(-1,3) and X(7,-1)
A(3,1) B(0,4) C(-3,1) D(-4,0)
HELP

Candice uses the function f(t)=t+100−−−−−−√ to model the number of students in her after-school program. the variable t represents days and f(t) represents the number of students. how many days does it take for there to be 15 students in her program? a. 225 days b. 125 days c. 325 days d. 115 days