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USPshnik [31]
2 years ago
8

Select all of the following that are quadratic equations.

Mathematics
1 answer:
Anastasy [175]2 years ago
7 0

Answer:

These are the quadratic equations

x^2 - 4 x = 4 x + 7

x^2 - 4 x = 4 x + 7

x^3 - 2 x^2 + 1 = 0

3 x^2 + 5 x - 7 = 0

Step-by-step explanation:

Equations that follow this formula ( ax^2+ bx+ c= 0 ) are considered as quadratic equations

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4 0
3 years ago
1/4×10/12 simplest form
Mashcka [7]

Answer:

10/48 - 2/24 - 1/12

Step-by-step explanation:

answer is 1/12

3 0
2 years ago
The dimensions of a rectangular piece of paper are 8.5 inches and 11 inches. Veronica folded the piece of paper along its diagon
Mashutka [201]

Answer:

D) 13.9 in

Step-by-step explanation:

The diagonal of a rectangle is longer than the longest side. It will never be more than 42% of the shortest side longer than the longest side.

Here, the longest side is 11 inches. 42% of the shortest side is about 3.6 inches, so the diagonal length will be between 11 and 14.6 inches. Only one answer choice is in that range: 13.9 in.

Of course, the length of the diagonal can be figured to any desired accuracy using the Pythagorean theorem.

... √(8.5² +11²) = √193.25 ≈ 13.9014 . . . . inches

_____

<em>Comment on the solution</em>

For this multiple-choice problem, it is sufficient to estimate the length of the diagonal. The estimate we suggested was to add 0.42 times the short side to the long side.

An even closer estimate can be had by multiplying that value (.42×short side) by the ratio of the short to long sides prior to adding it to the long side. This will get you within 1.5% of the correct value without the need for a square root.

3 0
3 years ago
Find the product of 3 x 1/7
shutvik [7]

Answer:

About .42

Step-by-step explanation:

8 0
3 years ago
Simplify<br> 2x + y - 3x + 4y + 2x
spin [16.1K]

Answer:

x+5y

Step-by-step explanation:

just combine like terms

7 0
2 years ago
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