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Alex17521 [72]
3 years ago
14

What is the missing coefficient?x2 + 4x+2xx2 + xplease help me​

Mathematics
1 answer:
olchik [2.2K]3 years ago
7 0
6
x^2 + 6x since 4x + 2x = 6x
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Help !! No work is needed to be shown
o-na [289]

Step-by-step explanation:

By Law of Indices, a^m / a^n = a^(m-n).

Therefore a² / a⁸ = a^(-6).

x = -6.

5 0
3 years ago
(CO 4) In a sample of 8 high school students, they spent an average of 24.8 hours each week doing sports with a sample standard
AveGali [126]

Answer:  

(22.12, 27.48)

Step-by-step explanation:

Given : Significance level : \alpha: 1-0.95=0.05

Sample size : n= 8 , which is a small sample (n<30), so we use t-test.

Critical values using t-distribution: t_{n-1,\alpha/2}=t_{7,0.025}=2.365

Sample mean : \overline{x}=24.8\text{ hours}

Standard deviation : \sigma=3.2\text{ hours}

The confidence interval for population means is given by :-

\overline{x}\pm t_{n-1,\alpha/2}\dfrac{\sigma}{\sqrt{n}}

i.e. 24.8\pm(2.365)\dfrac{3.2}{\sqrt{8}}

24.8\pm2.67569206001\\\\\approx24.8\pm2.68\\\\=(24.8-2.68, 24.8+2.68)=(22.12, 27.48)

Hence, the 95% confidence interval, assuming the times are normally distributed.=  (22.12, 27.48)

6 0
3 years ago
What’s the slope of (-3, 6), (2, 6)?
IRINA_888 [86]

Answer:

0

Step-by-step explanation:

(y2-y1)/(x2-x1)

6(y2)-6(y1)= 0

2(x2)- -3(x1)=5

0/5=0

4 0
3 years ago
Which graph best represents a quadratic function that has only one zero?
GenaCL600 [577]

Answer:

B

Step-by-step explanation:

A has 2 it crosses the x axis 2x

B Has 1.

C has 2

D has none since it never touched the x axis

8 0
2 years ago
Read 2 more answers
8(8p+8)=640 solve <br> Answer ASAP please
Ede4ka [16]

Answer:

p = 9

Step-by-step explanation:

8(8p + 8) = 640

use the dist property

64p + 64 = 640

<u>         -64      -64</u>

64p = 576

divide by 64

p = 9

6 0
3 years ago
Read 2 more answers
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