Given: ΔABC Prove: All three angles of ΔABC add up to 180°.

The flowchart with missing reason proves the measures of the interior angles of ΔABC total 180°:

Which reason can be used to fill in the numbered blank space?

Definition of Supplementary Angles

Substitution

Definition of Complementary Angles

Angle Addition Postulate

Find the value of x for which the lines are parallel.

In the sixth grade 13 out of 20 students have a dog if there are 152 sixth grade students how many of them have a dog

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)