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alekssr [168]
2 years ago
14

Find an expression which represents the sum of (7x-y)(7x−y) and (5x+3y)(5x+3y) in simplest terms.

Mathematics
1 answer:
lisov135 [29]2 years ago
8 0

Answer:

Hello,

Step-by-step explanation:

(7x - y)(7x - y) + (5x+3y)(5x+3y)\\\\=(7x-y)^2+(5x+3y)^2\\=(49x^2-14xy+y^2)+(25x^2+30xy+9y^2)\\\\\boxed{=74x^2+16xy+10y^2}

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Use a 95​% prediction interval to predict the useful life of a brand A cutting tool when the cutting speed is 45 meters per minu
qwelly [4]

Answer:

<em>The answer resides in the explanation.</em>

<em>Pls rate as brainliest </em>

Step-by-step explanation:

The predicted useful life of a brand A cutting tool when the speed is 45 meters per minute is 1.2 to 5.5 hours.

The predicted useful life of a brand B cutting tool when the speed is 45 meters per minute is 3.4 to 5.4 hours.

The prediction interval for brand A is larger than the prediction interval for brand B because the estimated standard error of  y^ is different for the two intervals.

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6 0
3 years ago
The product of a number and -3 increased by 8 is 20
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Answer:

The answer would be -4.

Step-by-step explanation:

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8 0
3 years ago
Clea eats ten Hershey kisses every 2 weeks, gives a Hershey bar to her sister every 3 weeks, and visit Hershey store every 6 wee
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Answer:

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Step-by-step explanation:

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3 years ago
Cylinder A is mathematically similar to cylinder B. The height of cylinder A is 10cm and its surface area is 440cm2​ ​. The surf
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Answer:

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9 =  \frac{h}{10}

h=90

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3 years ago
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