9.2. Because you add up all of the numbers then divide by how many numbers you have. 8+5+14+12+7= 46 then divide by 5.
Mixed number form :- 2 9/40
Decimal :2.22
Exact form :89/40
First factor x^2+13x+36 using the AC method. Then if any individual factor on the left side of the equation is equal to zero the whole expression will equal zero. After that set x+4 equal to zero and solve for x and do the same for 9. Lastly your answer is all the values of (x+4)(x+9)=0 true.
Check the picture below. When will it reach its height? well, at the vertex, so
a. ((x2-x1)^2 + (y2-y1)^2)^(1/2)
(-4-8)^2 + (1-5)^2 144+16= 160
160^(1/2)= 12.64
b. (8-4)/2 & (5+1)/2
4/2=2 6/2=3
(2,3) is the midpoint of AB