What is the explicit rule for the sequence?

10.5, 9, 7.5, 6, 4.5, 3, ...

an=12−1.5n
an=12+1.5n
an=12.5−1.5n
an=11−1.5n

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

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

Is the number 128.439 a rational number