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expeople1 [14]
2 years ago
13

Number 4, 5, 6, 7 please and thank you so much

Mathematics
1 answer:
nevsk [136]2 years ago
4 0
4) B.
No equation is given, so there is no "solution". The solution to f(x) = 0 is found where the graph crosses the x-axis. You have to read the graph to find these points as (-3, 0) and (2, 0), so "solutions" are -3, 2.

5) B.
All quadratic functions have two zeros. The two zeros for this function are identical (±0), so are usually counted as one (distinct) zero.

6) C.
(-b±√(b^2-4ac))/(2a) = (3±√(9+40))/2 = (3±7)/2 = {-2, 5}

7) B.
The product of the roots (-6) is the constant term. The sum of the roots (1) is the negative of the x-coefficient. You are looking for x^2 -1x -6 = 0
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Factor 20x2 + 25x – 12x – 15 by grouping. 1. Group terms with common factors. 2. Factor the GCF from each group. 3. Write the po
RUDIKE [14]
<span>Step 1:
</span>
<span> (((22•5x2) + 25x) - 12x) - 15)))

</span>
<span>The first term is, <span> <span>20x2</span> </span> its coefficient is <span> 20 </span>.
The middle term is, <span> +13x </span> its coefficient is <span> 13 </span>.
The last term, "the constant", is <span> -15



</span></span>
<span>step 2 above,  -12  and  25 
                     <span>20x2 - 12x</span> + 25x - 15

Step-4 : Add up the first 2 terms, pulling out like factors :
                    4x • (5x-3)
              Add up the last 2 terms, pulling out common factors :
                    5 • (5x-3)
Step-5 : Add up the four terms of step 4 :
                    (4x+5)  •  (5x-3)
             Which is the desired factorization</span>Final result :<span> (5x - 3) • (4x + 5) </span>
5 0
2 years ago
Read 2 more answers
Look at the figure. Find the value of x.<br> 100<br><br><br> 80<br><br><br> 45<br><br><br> 90
Mkey [24]

The answer is 90°

The sum of all angle in a triangle is 180°

So,

180-(45+45)

= 180-90

= 90°


5 0
3 years ago
Read 2 more answers
Evaluate the following expression when x = 4 and y = 5:
astraxan [27]
It is d hope it is correct

7 0
2 years ago
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A pathologist knows that 14.9% of all deaths are attributable to myocardial infarctions (a type of heart disease). (Either you h
garik1379 [7]

Answer:

a) The mean number is 745 and the standard deviation is 25.18.

b) 896 deaths is a significantly high number, which means that there is cause for concern.

Step-by-step explanation:

For each death, there are only two possible outcomes. Either it is attributable to myocardial infarctions, or it is not. The probability of a death being attributable to myocardial infarctions is independent of other deaths. So we use the binomial probability distribution to solve this question.

Binomial probability distribution

Probability of exactly x sucesses on n repeated trials, with p probability.

The expected value of the binomial distribution is:

E(X) = np

The standard deviation of the binomial distribution is:

\sqrt{V(X)} = \sqrt{np(1-p)}

A value X is significantly high is:

X > E(X) + 2\sqrt{V(X)}

In this problem:

p = 0.149, n = 5000

a. Find the mean and standard deviation for the number of such deaths that will occur in typical region with 5000 deaths.

E(X) = np = 5000*0.149 = 745

\sqrt{V(X)} = \sqrt{np(1-p)} = \sqrt{5000*0.149*0.851} = 25.18

The mean number is 745 and the standard deviation is 25.18.

b. In one region, 5000 death certificates are examined, and it is found that 896 deaths were attributable to myocardial infarction. Is there cause for concern? Why or why not?

Is 896 a significantly high number?

E(X) + 2\sqrt{V(X)} = 745 + 2*25.18 = 795.36

895 > 795.36

896 deaths is a significantly high number, which means that there is cause for concern.

6 0
3 years ago
How many 2cm×2cm cubes can be packed in a box 1m long,20cm wide and 4cm deep.​
Artemon [7]

Answer:

yetrygegegegr

Step-by-step explanation:

4 0
2 years ago
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