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3 years ago

Solve the equation x2 18x + 21 = -3x to the nearest tenth.

Mathematics

1 answer:

Bumek [7]3 years ago

7 0

Answer:

1x=-29

2x=-1

Step-by-step explanation:

i hope its useful.

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Express the ratio 5 : 20 as a percentage.

Fantom [35]

5 : 20 as a percentage equals 5/20, which is 0.25 or 25%

8 0

3 years ago

NNADVOKAT [17]

Answer:

x=14.5

If the answer is 14.5 move to J.

Explanation:

The sum of adjacent angles is 180

(8x-11)+(4x+17)=180

12x+6=180

12x=174

x=14.5

3 0

3 years ago

Given: p: 3x + 7 = –5 q: 4x + 12 = –4 Which is the contrapositive of p → q?

Anna35 [415]

Answer:

D :If 4x + 12 ≠ –4, then 3x + 7 ≠ −5.

4 0

3 years ago

A peony plant with red petals was crossed with another plant having streaky petals. A geneticist states that 75% of the offsprin

Strike441 [17]

Answer:

The sample data confirm the geneticist's prediction that 75% of the offspring from this cross will have red flowers.

Step-by-step explanation:

A Chi-square goodness of fit test can be used to test the claim made by the geneticist.

The hypothesis is defined as:

H₀: There is no difference between the observed and expected value,i.e. p₁ < 0.75.

Hₐ: There is a significant difference between the observed and expected value, i.e. p₁ > 0.75.

The test statistic is:

$\chi^{2}=\sum \frac{(O-E)^{2}}{E}$

Consider the tables attached below.

The value of the test statistic is:

$\chi^{2}=\sum \frac{(O-E)^{2}}{E}=25.8133$

The critical value is:

$\chi^{2}_{\alpha, k-1}=\chi^{2}_{0.01, 1}=6.635$

*Use a Chi-square table.

The critical region is:

$\chi^{2}\geq 6.635$

The test statistic value of 25.8133 lies in the critical region.

The null hypothesis is rejected at 1% level of significance.

Conclusion:

As the null hypothesis is rejected it can be concluded that 75% of the offspring from this cross will have red flowers.

7 0

3 years ago

Select True or false for each statement

PilotLPTM [1.2K]

Answer:

False

True

False

Step-by-step explanation:

1. We have to get the sum as follows :

$3\frac{4}{9} + 4\frac{6}{9}$

= $\frac{31}{9} + \frac{42}{9}$

= $\frac{31 + 42}{9}$

= $\frac{73}{9}$

= $8\frac{1}{9} \neq 7\frac{1}{9}$

So, this is false.

2. We have to get the sum as follows :

$4\frac{5}{6} + 1\frac{3}{6}$

= $\frac{29}{6} + \frac{9}{6}$

= $\frac{29 + 9}{6}$

= $\frac{38}{6}$

= $6\frac{2}{6}$

So, this is true.

3. We have to get the difference as follows :

$4\frac{5}{8} - 2\frac{4}{8}$

= $\frac{37}{8} - \frac{20}{8}$

= $\frac{37 - 20}{8}$

= $\frac{17}{8}$

= $2\frac{1}{8} \neq 2\frac{3}{8}$

So, this is false.

4. We have to get the difference as follows :

$7\frac{5}{8} - 4\frac{2}{8}$

= $\frac{61}{8} - \frac{34}{8}$

= $\frac{61 - 34}{8}$

= $\frac{27}{8}$

= $3\frac{3}{8} \neq 3$

So, this is also false. (Answer)

5 0

4 years ago