At least one angle is acute.

what is the first step of indirectly proving this statement?

assume at least one angle is not acute.

assume none of the angles are acute.

assume none of the angles are obtuse.

assume at least one angle is obtuse.

The multiplication property of zero states that the product of any number and 0 is 0. what must be true about either a or b to make ab=0

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)] =?

Write a fraction less than 1, which has a denominator of 6 and is greater than 3/4 plz answer !