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FrozenT [24]
2 years ago
13

Select all of the following that are quadratic equations.

Mathematics
1 answer:
goldenfox [79]2 years ago
8 0

Answer:

1. x² + 3x - 5 = 0

2. x² - x = 3 x + 7

4. 7x² + 14x = 0

Step-by-step explanation:

A Quadratic equation takes the form;

ax² + bx + c = 0

a, b, c are constants and a cannot be 0.

Options 1 fits this;

x² + 3x - 5 = 0

Option 2 fits this as well;

x² - x = 3 x + 7  

x² -x - 3x - 7 = 0

x² - 4x - 7 = 0

Option 4 fits this as well if c = 0.

7x² + 14x + 0 = 0

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Pie

Check the picture below.

8 0
2 years ago
I’m really struggling! Please help me!!
Andrew [12]

Answer:

8.0

Step-by-step explanation:

The triangle is a right triangle, so we are able to use trigonometric functions. Relative to the angle of 37°, we have the opposite side which is 6 and the adjacent side which is x. The trig function that uses the opposite and adjacent is tangent(SohCahToa). We can set up the following equation:

tan(37) = \frac{opposite}{adjacent}

tan(37) = \frac{6}{x}

tan(37) evaluates to about , so we can plug it in and solve for x:

0.7536 = \frac{6}{x} \\0.7536x = 6\\x = 7.962

To the nearest tenth, x rounds to 8.0.

4 0
2 years ago
Pretty please help! there are 4 graphs.
Iteru [2.4K]

Answer: The answer is D.

Step-by-step explanation: Considering that the dots represent people, all you have to do is count the dots. Graph D is the only plot that has three in both 6 and 8.

Hope this helps & Good Luck,

Melodii

8 0
2 years ago
Read 2 more answers
Mini muffins cost $3 per dozen
snow_tiger [21]

Answer:

agree with both because 1 dollar = 4 muffins so 2 x 4 = 8 muffins and 4x4 = 16 muffins

3 0
3 years ago
Write a formula for this sequence: 8,-1,-10,-19
Romashka [77]
This is an arith. sequence, and the common difference is -9.

a(n+1) = a(n)-9, with a(1)=8.  Thus, if we look at the first term, we see 8; subracting 9 from 8 produces the second term (-1).
4 0
3 years ago
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