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8090 [49]
3 years ago
15

Y= -(x - 1)(x + 3) has how many real roots?

Mathematics
1 answer:
olchik [2.2K]3 years ago
3 0

Answer:

A.2

Step-by-step explanation:

y= -(x - 1)(x + 3)

To find the roots, set y=0

0 = -(x - 1)(x + 3)

Using the zero product property

x-1 =0   x+3=0

x=1      x =-3

There are 2 real roots

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Round 253.5198 to the nearest thousandth
kipiarov [429]

Answer:

253.520

Step-by-step explanation:

Let us see what is the thousandths place...

It is the third digit to the right.

253.5198 rounded is about

253.520.

I can tell because you take the thousandths place, look at the one to the right of it, then if it is greater than 5, you make the thousandths place greater. Since it's a 9, you move the extra 10 thousandths to the next thing- the hundredths. and you get 253.520.

4 0
3 years ago
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PLS ANSWER FAST ! 100 POINTS + BRAINLIEST IF CORRECT ! TSM
denis-greek [22]

Answer:

36 inches by 18 inches

Step-by-step explanation:

We are dilating by a factor of 3, which means the image gets larger

12*3 = 36 inches

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3 years ago
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Olivia walked 2 2/5 km in 2/3 hour while Ryan walked 4 1/2 km in 1 1/2 hours. Who walked faster and how much faster?
Aleks04 [339]
Find the unit rate for each Olivia and Ryan:

2 2/5 km       15       36 km
------------ * ------- = ------------ = 3.6 km/hr (Olivia)
 2/3 hr          15        10 hr


4 1/2 km          2          9 km
------------- * --------- = --------- = 3 km/hr (Ryan)
1 1/2 hr           2           3 hr

Olivia walked 0.6 km/hr faster than did Ryan.



7 0
3 years ago
Sum n=3 ^ infty (2n+5)<br>find the series shown​
Margarita [4]
<h3>Answer: Choice C) 11 + 13 + 15 + 17 + ...</h3>

=====================================================

Explanation:

We're adding terms in the form (2n+5)

The first term is when n = 3, so

2n+5 = 2*3+5 = 6+5 = 11

The next term is when n = 4, so

2n+5 = 2*4+5 = 8+5 = 13

The next term is when n = 5, so

2n+5 = 2*5+5 = 10+5 = 15

And so on

This means,

\displaystyle \sum_{n=3}^{\infty} (2n+5) = 11+13+15+17+\ldots

which matches with choice C. The three dots indicates the pattern goes on forever.

-------------------

Choice B does not have these dots, so that's why choice B is not the answer. If we replaced the infinity symbol with 7, then choice B would be the answer.

I.e,

\displaystyle \sum_{n=3}^{7} (2n+5) = 11+13+15+17+19

8 0
4 years ago
How to write the ratio 8:30 as a fraction in simplest form
omeli [17]
4/15 because you make it into a fraction: 8/30, you find the GCF which is 2, so then you divide both the numerator and denominator by 2 and get 4/15 at it's simplest term
5 0
3 years ago
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