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Oxana [17]
3 years ago
5

PLS HELP IM TIMED!! ILL MARK U BRAINLIEST

Mathematics
2 answers:
netineya [11]3 years ago
6 0

Answer:

D

Step-by-step explanation:

7x² - 56x = 63 ( divide through by 7 )

x² - 8x = 9

To complete the square

add ( half the coefficient of the x- term )² to both sides

x² + 2(- 4)x + 16 = 9 + 16

(x - 4)² = 25 ( take square root of both sides )

x - 4 = ± \sqrt{25} = ± 5 ( add 4 to both sides )

x = 4 ± 5

Then

x = 4 - 5 = - 1

x = 4 + 5 = 9

solutions are (- 1, 9 ) → D

pashok25 [27]3 years ago
3 0

Answer:

A

Step-by-step explanation:

I looked up the answer

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Rudiy27
Looking at this problem in terms of geometry makes it easier than trying to think of it algebraically.

If you want the largest possible x+y, it's equivalent to finding a rectangle with width x and length y that has the largest perimeter.

If you want the smallest possible x+y, it's equivalent to finding the rectangle with the smallest perimeter.

However, the area x*y must be constant and = 100.

We know that a square has the smallest perimeter to area ratio. This means that the smallest perimeter rectangle with area 100 is a square with side length 10. For this square, x+y = 20.

We also know that the further the rectangle stretches, the larger its perimeter to area ratio becomes. This means that a rectangle with side lengths 100 and 1 with an area of 100 has the largest perimeter. For this rectangle, x+y = 101.

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3 years ago
Nancy winter local zoo that featured 11 monkey exhibits if these monkey exhibit make up 55% of the zoo exhibits then how many ex
NeTakaya

Answer:

20 total exhibits at the zoo

Step-by-step explanation:

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4 0
3 years ago
the north pole is in the middle of the ocean. A person at sea level at the north pole would be 3,949 miles from the center of th
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Answer:

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Step-by-step explanation:

It is given that the North Pole is at a distance of 3,949 miles from the center of the earth.

We also know that the sea floor is below 2.4 miles from the sea level.

It is given that a submarine is located at the sea floor near North Pole. Hence, the distance of the submarine from the center of the earth would be

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On the other hand, the South Pole is given to be at an elevation of 1.7 miles from the sea level.

Since we know that the sea level is at a distance of 3949 miles from the center of the earth, we can immediately calculate the distance of the South Pole from the center of the earth to be

3949 + 1.7 = 3950.7 miles.

Putting all of this together, we see that the center of the earth is at a distance of 3946.6 miles from the submarine near the North Pole, and the center of the earth in turn is 3950.7 miles from the South Pole.

Hence, the distance between the submarine and a person on the South Pole = 3946.6 + 3950.7 = 7897.3 miles.

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