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Dmitry_Shevchenko [17]
3 years ago
7

Solve 2x2 + 20x = −38.

Mathematics
1 answer:
cestrela7 [59]3 years ago
4 0
2x^2+20x=-38  divide both sides by 2

x^2+10x=-19, halve the linear coefficient, square it, than add that value to both sides of the equation, in this case add (10/2)^2=25...

x^2+10x+25=6  now the left side is a perfect square

(x+5)^2=6  take the square root of both sides

x+5=±√6  subtract 5 from both sides

x=-5±√6    (so answer c.)
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Answer:

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Step-by-step explanation:

1/8 is 1.25 and that times 5 is .625. .625 * 100 = 62.5

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Answer:

boys + girls =  45  -------(1)

There boys 17 more than girls, boys = girls + 17  ----------(2)

substitute (2) in (1)

girls + 17 + girls = 45

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2 x  girls = 45 - 17

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At a flea market. 78 booths are arranged in 6 rows. There are the same
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Answer:

B. 13 Booths

Step-by-step explanation:

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3.7 x 10 to the power of 2​
bekas [8.4K]

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Andrews [41]

Answer:

Answer for the question :

A resercher is wondering whehter the drinking habits of adults in a certain region of the country are in the same proportion as the general population of adults. Suppose a recent study stated that the proportion of adults who reported drinking once a week or less in the last month was 0.26. The researcher's null hypothesis for this test is H0: P=0.26 and the alternative hypothesis is Ha; P> 0.26. The researcher collected datat from a random sample of 75 adults in the region of interest.

1- Verify that the normality assumption is satisfied. Describe each separately.

2- To cotinue the study into the drinking habits of adults, the researcher decides to collect datat from adults working in "blue collar" jobs to see whether their drinking habits are in the same proportion as the general public. The null hypothesis for this test is H0: P=0.26 and the alternative hypothesis is Ha: P>0.26. The researcher computer the test statistic to be 1.59. Draw a graph of z distribution, label the test statistic and shade the p-value associated with this test statistic."

is given in the attachment.

Step-by-step explanation:

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