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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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Matthew is four years younger than his brother Kevin,when Matthew was 7,how old was his brother
cestrela7 [59]

Answer:

Kevin was eleven years old.

Step-by-step explanation:

7+4=11, since the question says Matthew is younger by four years.

8 0
3 years ago
Read 2 more answers
14. A bag contains 20 marbles. There are 4 blue
Vladimir [108]

Answer:

30%, or 1/3

Step-by-step explanation:

If there are 20 total marbles, and 6 of them are red, to find the probability of pulling a red marble you would do 6/20, which simplifies to 1/3. This can also be written as 30%.

Hope this helps! :)

4 0
2 years ago
How does unemployment hurt an economy? Check all that apply.
stellarik [79]
The <u>correct answers</u> are:

Unemployed people usually buy fewer things.
Unemployed people may not be able to repay their loans.
Unemployed people may have to to change their financial goals.

Explanation:

If someone is unemployed, they have much less money with which to purchase items, so they usually purchase less.  This hurts the businesses that would profit from these purchases.

If someone is unemployed, their ability to pay their bills is affected since their income is gone.  This means they may not be able to repay any loans they have in their name.  This hurts the banks that have loaned the money.

If someone is unemployed, they may have to adjust their financial priorities.  If they were looking to invest money, they no longer have it to invest.  If they were looking to purchase real estate, again, they no longer have the money to do that.  This hurts banks that they may invest through and the people or agencies that they would be purchasing real estate through.
7 0
3 years ago
Read 2 more answers
Lola measures three buttons for a shirt she’s making. One button is 1/8, 3/8 and 1/4 inch. The button hole is 2/6 of an inch. Wh
mel-nik [20]

Answer:

3/8

Step-by-step explanation:

That's the only one bigger than 2/6, any smaller will fall out as it's a button. You'd twist it sort of in half to get it in the hole, therefore, 3/8 is the only button that will fit.

I'm not sure if this is correct but this is how I'd go about it :)

7 0
3 years ago
Using the net below, find the surface area of the triangular prism.
Luden [163]

Answer:

Hi, there! The total surface area of that prism is 118 cm^2.

Step-by-step explanation:

The three rectangles on the side are called the lateral area, and they add up to 98(I'm assuming you know how to find the area of a 2d shape), and as for the triangles on the sides, you can just use the formula which is b*h/2.

Hope this helps :)

4 0
2 years ago
Read 2 more answers
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