Which graph represents the solution set for the quadratic inequality x2 + 2x + 1

Please answer this questions please. Will mark brainliest!!! The one with red circled.

patriot [66]

Answer/Step-by-step explanation:

1.a)(iv). $\frac{1}{6} + (-\frac{7}{8}$

Positive multiplied by negative = negative

$\frac{1}{6} - \frac{7}{8}$

$\frac{4 - 21}{24} = \frac{-17}{24} = -\frac{17}{24}$

2a.) 73.48 +(-37.3)

$Note: + * - = -$

73.48 - 37.3 = 36.18

3c.) $3\frac{3}{4}$ ÷ $(-4\frac{2}{7})$

Convert to proper fraction

$\frac{15}{4}$ ÷ $(-\frac{30}{7})$

Change ÷ to × and flip the fraction on your right upside down

$\frac{15}{4} * (-\frac{7}{30})$

$-\frac{15*7}{4*30}$

$-\frac{1*7}{4*2} = -\frac{7}{8}$

3d.) -52.25 ÷ (-5.5) = $\frac{-52.25}{-5.5}$

(Note: - ÷ - = + )

$\frac{-52.25}{-5.5} = 9.5$

3 0

4 years ago

Please answer correctly !!!!! Will mark Brianliest !!!!!!!!!!!!!!

podryga [215]

Answer:

Step-by-step explanation:

30 meters

5 0

3 years ago

2x=5 what do we divide by?

larisa [96]

We divide by 2 on both sides.

We get the final answer as

x = 5/2 = 2.5

8 0

3 years ago

Read 2 more answers

An equation of a function y(t) is shown.

Sav [38]

From the given function, to explain the correct answer I will plot the graph for :
y(t)=-t^2+14t-40
thus the graph will be as shown in the figure:
From the graph we deduce that the correct statement is:
y'(t)=-2t+14=0
thus
t=7
thus
y(7)=0
thus the correct statement is:
<span>c. The average rate of change over the interval 6≤t≤8 is 0</span>

6 0

3 years ago

Emissions of sulfur dioxide by industry sett off chemical changes in the atmosphere that result in "acid rain". The acidity of l

horsena [70]

Answer:

Case n =5

$z=\frac{4.8-5}{\frac{0.5}{\sqrt{5}}}=-0.894$

Case n =15

$z=\frac{4.8-5}{\frac{0.5}{\sqrt{15}}}=-1.549$

Case n = 40

$z=\frac{4.8-5}{\frac{0.5}{\sqrt{40}}}=-2.530$

P value

Case n =5

$p_v =P(z$

Case n =15

$p_v =P(z$

Case n =40

$p_v =P(z$

Step-by-step explanation:

Data given and notation

$\bar X=4.8$ represent the sample mean

$\sigma=0.5$ represent the population standard deviation

$n$ sample size

$\mu_o =5$ represent the value that we want to test

$\alpha$ represent the significance level for the hypothesis test.

z would represent the statistic (variable of interest)

$p_v$ represent the p value for the test (variable of interest)

State the null and alternative hypotheses.

We need to conduct a hypothesis in order to check if the mean is lower than 5, the system of hypothesis would be:

Null hypothesis: $\mu \geq 5$

Alternative hypothesis: $\mu < 5$

Since we know the population deviation, is better apply a z test to compare the actual mean to the reference value, and the statistic is given by:

$z=\frac{\bar X-\mu_o}{\frac{\sigma}{\sqrt{n}}}$ (1)

z-test: "Is used to compare group means. Is one of the most common tests and is used to determine if the mean is (higher, less or not equal) to an specified value".

Calculate the statistic

We can replace in formula (1) the info given like this:

Case n =5

$z=\frac{4.8-5}{\frac{0.5}{\sqrt{5}}}=-0.894$

Case n =15

$z=\frac{4.8-5}{\frac{0.5}{\sqrt{15}}}=-1.549$

Case n = 40

$z=\frac{4.8-5}{\frac{0.5}{\sqrt{40}}}=-2.530$

P-value

Since is a left tailed test the p value would be:

Case n =5

$p_v =P(z$

Case n =15

$p_v =P(z$

Case n =40

$p_v =P(z$

5 0

4 years ago

Which graph represents the solution set for the quadratic inequality x2 + 2x + 1 > 0?