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A scuba diver uses negative numbers to represent her depths below sea level. She was at a depth of -1.5 meters. A few minutes later she continued another -4.2 meters to the ocean floor below. What was her final depth? Write your expression, show your work, and label your answer.

Respuesta :

Answer: What was her final depth? -6.7 m

Step-by-step explanation:

First we are going to locate a zero point on the ocean surface, which will give us a reference in order to write the expression. After we are going to locate the first point, A = -1.5 m. Then we will locate the ocean floor and call it B, that is the unknown variable, but we know the distance between A and B, that is 4.2 m, afterwards we will make our expression: B - A = -4.2 m, this is the expression that will allow us to know the value of B, because we already know A. So we replace the values: B - (-1.5 m) = - 4.2m, then we operate the signs: B + 1.5 m = - 4.2 m. After we put the 1.5 in the other side of the equations so B is alone in one side: B = -4.2 m - 1.5 m. After we operate the two numbers: B = - 6.7 m. And with this we know our final answer.

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