The surface of the lake is at sea level, with an elevation of O feet. Tina swims to an elevation of The surface of the lake is at sea level with a elevation of 0 feet. Tina swims to an elevation of -5 feet. Then she swims 5 feet up. What is Tina‘s elevation now?

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

b

step-by-step explanation:

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