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Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Is the power produced directly proportional to the wind speed, give reasons for your answer?

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?