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Vanyuwa [196]
3 years ago
8

What is the value of 7x^2 + 3x + 4 when x=2?

Mathematics
2 answers:
Nonamiya [84]3 years ago
8 0

Answer:

38

Step-by-step explanation:

substitute the value of the variable into an equation, then simplify

DerKrebs [107]3 years ago
3 0

Answer:

38

Step-by-step explanation:

To find the value of 7x^2 + 3x + 4 when x=2. We have to plug in x. So plugging x in, we have

7(2)^2 +3(2) +4

and this becomes

7(4) + 6 +4

or

8(4)+6

which is 38

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A quality control technician works in a factory that produces computer monitors. Each day, she randomly selects monitors and tes
jeka94

Answer:

There is enough evidence to support the claim that the true proportion of monitors with dead pixels is greater than 5%.

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 300

p = 5% = 0.05

Alpha, α = 0.05

Number of dead pixels , x = 24

First, we design the null and the alternate hypothesis  

H_{0}: p = 0.05\\H_A: p > 0.05

This is a one-tailed(right) test.  

Formula:

\hat{p} = \dfrac{x}{n} = \dfrac{24}{300} = 0.08

z = \dfrac{\hat{p}-p}{\sqrt{\dfrac{p(1-p)}{n}}}

Putting the values, we get,

z = \displaystyle\frac{0.08-0.05}{\sqrt{\frac{0.05(1-0.05)}{300}}} = 2.384

Now, we calculate the p-value from excel.

P-value = 0.00856

Since the p-value is smaller than the significance level, we fail to accept the null hypothesis and reject it. We accept the alternate hypothesis.

Conclusion:

Thus, there is enough evidence to support the claim that the true proportion of monitors with dead pixels is greater than 5%.

5 0
2 years ago
Other ways to write 50897
NARA [144]
Written form: fifty thousand eight hundred ninety-seven.

expanded form: 50000+800+90+7
3 0
3 years ago
Read 2 more answers
For each graph below, state whether it represents a function.<br>​
UkoKoshka [18]
Graph1-Yes
Graph2-yes
Graph 3- NO
Graph4-yes
Graph5-No
Graph6/No
5 0
2 years ago
What is the median of 137 115 104 to 63 and 98
Romashka-Z-Leto [24]

Answer:

104

Step-by-step explanation:

put them from  less to highest  then find the middle number

5 0
2 years ago
Please help i need you
Natali [406]
The answer is A.0

hope this helped
4 0
2 years ago
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