How do i put this number into scientific notation? 9,460,730,472,580.8?

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Plz hurry evaluate the expression a+b where a=8 and b=19

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