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borishaifa [10]
3 years ago
13

Subtract 5x^2 + 2x - 11 from 3x^2 + 8x - 7. Express the result as a trinomial.

Mathematics
1 answer:
eimsori [14]3 years ago
4 0
(3x^2+8x-7)-(5x^2+2x-11)\\3x^2+8x-7-(5x^2+2x-11)\\3x^2+8x-7-5x^2-2x+11\\-2x^2-6x+4

-2x^2-6x+4
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Explain why if a runner completes a 6.2â-mi race in 32 âmin, then he must have been running at exactly 11 âmi/hr at least twice
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Answer:

Accelerating to top speed, deaccelerating to finish line.

Step-by-step explanation:

If the runner kept a constant speed of 11 mph for the whole duration of his run (32 minutes), the distance he would have covered is:

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This means that, in order to run the full 6.2 miles, the runner needs to reach a speed over 11 mph. Assume he starts from rest, while accelerating the runner reaches, and the surpasses, the 11 mph mark. Since his speed at the finish line is zero, the runner has to deaccelerate from his current running speed (which should be higher than 11 mph), passing through 11 mph and reaching zero at the finish line.

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3 years ago
The perimeter of a rectangular swimming pool is 414 meters. The length of the pool is 7 meters more than four times the width. F
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Answer:

Width = 40 meters

Length = 167 meters

Step-by-step explanation:

Let

Width of the pool = x meters

Then

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10x+14=414\\ \\10x=414-14\\ \\10x=400\\ \\x=40\ meters\\ \\4x+7=4\cdot 40+7=167\ meters

5 0
3 years ago
2. Simplify ((–3)2)3
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Answer:

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Step-by-step explanation:

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Then, you multiply -6 and 3 which equals  -18

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6 0
3 years ago
Find all the real square roots of 0.0036
amm1812
The square root of 0.0036 can be calculated through the calculator. The answer is 0.06. WE can also take by the eye the square root of 0.0036 in which the square root of 36 is 6. The number must be greater than 0.0036. The answer is 0.06.
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Answer:

Each quart is 1.31 to the customer.

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Cost of 1 quart to  Wong = 0.75

Cost to you or I = 0.75 * 175/100 = 1.31

He sells each quart for 1.31 dollars.

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3 years ago
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