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2 years ago

Am I correct? Please show your work so I can compare it to my work. Thank you!

Mathematics

1 answer:

Viefleur [7K]2 years ago

4 0

Answer:

200

Step-by-step explanation:

C = 0.007x² − 2.8x + 100

There are two ways we can find the minimum. The first is by noticing that this is an upwards parabola, so the minimum is at the vertex. For y = ax² + bx + c, the vertex is at x = -b/(2a).

x = -(-2.8) / (2 × 0.007)

x = 200

Alternatively, we can minimize C using calculus. Take the derivative with respect to x and set to 0:

dC/dt = 0.014x − 2.8

0 = 0.014x − 2.8

x = 200

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3 years ago

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Step-by-step explanation:

This is good! The length of the metal is 20 inches longer than the width. But we fold up 4-inch flaps on each side, so the height of the box is 4 inches, and the length and width will each decrease by 8 inches (4 inches on each side). Since the length and width decrease by the same amount, the length will still be 20 inches longer than the width. So the equations would be:

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3 years ago

Lea has 3/4 cup of laundry detergent left in detergent bottle. Each load of laundry requires 1/6 cup of detergent. How many load

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ANSWER

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EXPLANATION

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We now simplify this by multiplying with the reciprocal

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3 years ago

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Answer:

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Step-by-step explanation:

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