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sergey [27]
3 years ago
15

NEED HELP WITH THIS PLEASE. Just show me how please.

Mathematics
1 answer:
ohaa [14]3 years ago
5 0

Given:

The quadratic equation is:

-5x^2-3x-2=0

To find:

The discriminant of the given equation and the number of real solutions.

Solution:

If a quadratic equation is ax^2+bx+c=0, then the value of discriminant is:

D=b^2-4ac

If D<0, then the quadratic equation has no real roots or two imaginary roots.

If D=0, then the quadratic equation has two equal real roots.

If D>0, then the quadratic equation has two distinct real roots.

We have,

-5x^2-3x-2=0

Here, a=-5,b=-3,c=-2. So, the discriminant of the given equation is:

D=(-3)^2-4(-5)(-2)

D=9-40

D=-31

Since D<0, therefore the number of real solutions is 0.

Hence, the value of the discriminant is -31 and the number of real solutions is 0.

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Please answer asap. Will mark brainliest!!!
suter [353]

I started this and got distracted and never finished and it timed out. Focus Dean.

It's not the best graph; I assume the origin is the apparent origin and the y axis numbers go with the line above them.

This graph is M(V), M(V) is mass in kg of bucket with water volume V in liters

a) the mass of an empty bucket

That's the y intercept, M(0), eyeballing it around .7 kg

Answer: .7 kg

b) the mass of the bucket containing 1 liter of liquid

That's M(1), looks like 1.3 or so

Answer: 1.3 kg

c) the mass of one liter of liquid

That's the difference, M(1)-M(0), about .6 kg. We can get a better estimate from a longer slope, say (.5,1) to (3,3), (3-1)/(3-.5) = .8 kg.

Answer : 0.8 kg

d) the volume of the liquid in the bucket, if the total mass of bucket with the liquid is 3 kg.

Solve M(V)=3

That has a solution from the graph V=3.

Answer: 3 liters

8 0
3 years ago
Using the data in the table, which statement is true?
horsena [70]

Answer:  Choice C.  mean > median

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

Explanation:

Multiply each measure with their corresponding frequency.

  • 8*1 = 8
  • 10*3 = 30
  • 14*2 = 28

Add up those products: 8+30+28 = 66

Then divide by the total frequency n = 1+3+2 = 6 to get 66/6 = 11 as the mean.

mean = 11

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

Since we have n = 6 values in this list, this means the median is between slot n/2 = 6/2 = 3 and slot 4.

Note how that places us in the middle row because 1+3 = 4 encapsulates both of those slots mentioned. So the median is 10.

Or you could list out the values in roster notation {8, 10, 10, 10, 14, 14} to see that {10,10} occupy the middle most slots. So the median is (10+10)/2 = 20/2 = 10.

median = 10

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

The mode is simply the most frequent value. The table shows that mode = 10 since it occurs 3 times, compared to 8 showing up 1 time and 14 showing up twice.

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

We have the following summary

  • mean = 11
  • median = 10
  • mode = 10

With that in mind, let's go through the answer choices.

  1. We can see that mean < mode is false, since it should be mean > median, so cross choice A off the list.
  2. mean = median is also false, so choice B is crossed off as well.
  3. mean > median is true since 11 > 10 is true. Choice C is the answer. Note how this being true directly contradicts choice B, which is another reason to see why choice B is false.
  4. median > mode is false because 10 > 10 is false. It should be median = mode. Choice D is crossed off the list.
4 0
3 years ago
By what angle must AB¯¯¯¯¯ turn clockwise about point B to coincide with BC¯¯¯¯¯?
mart [117]
I hope this helps you




33.3+30.6



63.9
8 0
3 years ago
Read 2 more answers
Which function is equivalent to f(x)=-4(x+7)^2-6
Bess [88]

Pls mark Brainliest.

Answer:

f(x) = -4x² - 64x - 202

Step-by-step explanation:

We can simplify this quadratic function given in vertex form into standard form by simplifying the exponents and adding like terms.

f(x) = -4(x+7)^2 - 6

f(x) = -4(x^2 + 14x + 49) - 6

f(x) = -4x² - 64x - 196 - 6

f(x) = -4x² - 64x - 202

5 0
3 years ago
A number cube has the numbers 1, 2, 5, 5, 6, and 6 on its faces. Match the probability with the outcome. 1. P(5 ∪ 6) 2. P(2 ∪ 5
Tems11 [23]

Answer:

1. P(5 U 6) =2/3

2. P(2 U 5 U 6) = 5/6

3. P(1 U 2) = 1/3

4. P(4) = 0

Step-by-step explanation:

As the number cube has 6 sides,

So,

Total outcomes = {1,2,5,5,6,6}

n(S) = 6

Now,

1. P(5U6) = P(5) + P(6)

P(5)=2/6=1/3

P(6)=2/6=1/3

P(5U6)= 1/3 + 1/3 = 2/3

2. P(2 U 5 U 6) = P(2) + P(5) + P(6)

P(2)=1/6

P(5)=2/6

P(6)=2/6

P(2 U 5 U 6) = 1/6 + 2/6 + 2/6

= 5/6

3. P(1 U 2) = P(1) + P(2)

P(1) = 1/6

P(2)= 1/6

P(1 U 2) = 1/6 + 1/6

= 2/6 = 1/3

4. P(4) = 0

As 4 is not in the outcomes, it's probability will be zero ..

5 0
4 years ago
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