In 56 years kevin will be 9 times as old as he is right now. how old is he right now?

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)] =?

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?

Ithink i know it but i want to be sure so can you me out ?