Locate a point c on the x-axis such that ac+bc is minimized. c=). the endpoints of ab are:

1) a(1,4) and b(4,-1)
2) a(-3,2) and b(-6,-4)
3) a(-2,3) and b(-4,0)
4) a(1,-3) and b(-1,1)

i really need , i have no clue what i am doing. : -)

Atriangle has sides with lengths of 10 yards, 13 yards, and 18 yards. is it a right triangle?

3-12. write each answer with a reasonable number of figures. find the absolute uncertainty and percent relative uncertainty for each answer. (a) [12.41 (±0.09) + 4.16 (±0.01)] x 7.068 2 (±0.000 4) =? (b) [3.26 (±0.10) x 8.47 (±0.05)] - 0.18 (±0.06) =? (c) 6.843 (±0.008) x 104 + [2.09 (±0.04)- 1.63 (±0.01)] =?

Pat listed all the numbers that have 15 as a multiple write the numbers in pats list