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3 years ago

Factor this expression completely.

Mathematics

1 answer:

mixer [17]3 years ago

3 0

Answer: B -7(3x-4)

-7×3x=-21x

-7×-4=28

I hope this is good enough:

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Pls, it’s for a test , ;< . I Wanna actually Get a good grade. PLS HELP you will get 20 points

kow [346]

Answer: B. y=9
Explanation: divide both sides of the equation by three
y3/3 = y
27/3=9
y=9
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2 years ago

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Points M, N, D, and E are on a circle with center K. Also, ED is a diameter of the circle

Anestetic [448]

Answer:

Step-by-step explanation:

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3 years ago

A newspaper reported that 4040% of people say that some coffee shops are overpriced. The source of this information was a telep

vampirchik [111]

Answer:

a. Identify the population of interest in this study.

all the population of the country

b. Identify the sample for the study.

50 adults (the ones that were surveyed)

c. Identify the parameter of interest in the study.

the parameter of interest is the people that believe that coffee shops are overpriced

d. Find and interpret a 95% confidence interval for the parameter of interest.

z score for a 95% confidence level = 1.96

margin of error (E) = z score x √{[0.4(1 - 0.4)] / 50} = 1.96 x 0.069282 = 0.13579

95% confidence level interval:

0.4 - 0.13579 = 0.26421

0.4 + 0.13579 = 0.53579

95% confidence interval (0.26421 , 0.53579)

5 0

3 years ago

A) y B) y>x<br> C) y+x = 1<br> D) y/x = 1

Bond [772]

Answer:

The answer should be C

6 0

3 years ago

In the expansion (ax+by)^7, the coefficients of the first two terms are 128 and -224, respectively. Find the values of a and b

madam [21]

Answer:

a = 2, b = 3.5

Step-by-step explanation:

Expanding $(ax+by)^7$ using Binomial expansion, we have that:

$(ax+by)^7$ =

$(ax)^7(by)^0 + (ax)^6(by)^1 + (ax)^5(by)^2 + (ax)^4(by)^3 + (ax)^3(by)^4 + (ax)^2(by)^5 + (ax)^1(by)^6 + (ax)^0(by)^7$

$= (a)^7(x)^7+ (a)^6(x)^6(b)(y) + (a)^5(x)^5(b)^2(y)^2 + (a)^4(x)^4(b)^3(y)^3 + (a)^3(x)^3(b)^4(y)^4 + (a)^2(x)^2(b)^5(y)^5 + (a)(x)(b)^6(y)^6 + (b)^7(y)^7\\\\\\= (a)^7(x)^7+ (a)^6(b)(x)^6(y) + (a)^5(b)^2(x)^5(y)^2 + (a)^4(b)^3(x)^4(y)^3 + (a)^3(b)^4(x)^3(y)^4 + (a)^2(b)^5(x)^2(y)^5 + (a)(b)^6(x)(y)^6 + (b)^7(y)^7$