What is the value of a in the triangle shown? Use the Law of Cosines. Round your answer to the nearest integer.

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

What is the sum of the first 8 terms of the geometric series