A trough contains a certain amount of sand. After Jamie used it to fill a 2.4-kilogram bag, a 650-gram bowl, and a 3-kilogram,125-gram pail, she realized that she had a kilogram of sand left in the trough. How much sand was in the trough at first? Give your answer in grams, using a comma.

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