Complete these two different sets of data so that they each have six values and a mean of 21. 20, 20.5, 20.5, 21.5, 21.5,
20, 21, 21, 21, 21,

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)] =?

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

Which statements about these triangles is true