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Alja [10]
3 years ago
15

7. Bobby buys 10 pounds seafood for $30. It

Mathematics
1 answer:
DochEvi [55]3 years ago
8 0

Answer:

5 pounds of shrimp and 5 pounds of crawfish were purchased in the mixture.                                          

Step-by-step explanation:

We are given the following in the question:

Bobby buys 10 pounds seafood for $30.

Let x pounds of shrimp be purchased and y pounds of crawfish.

Thus, we can write,

x + y =10

Cost of shrimp = $5 per pound

Cost of crawfish = $1 per pound

Total money spent = $30

Thus, we can write the equation,

5x + y = 30

Solving the two equation by elimination method,

5x + y-(x+y) = 30-10\\4x = 20\\x = 5\\y = 10 - x = 10 - 5 = 5

Thus, 5 pounds of shrimp and 5 pounds of crawfish were purchased in the mixture.

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Find the value of the polynomial 3x<br> 3 – 4x<br> 2+ 7x + 5, when x = 3 and also when<br> x = –3.
babymother [125]

Answer:

71

-133

Step-by-step explanation:

Given the polynomial :

3x³– 4x² + 7x + 5, when x = 3 and also when

x = –3.

Put x = 3

3(3)³– 4(3)² + 7(3) + 5

3(27) - 4(9) + 21 + 5

81 - 36 + 21 + 5

= 71

Put x = - 3

3(-3)³– 4(-3)² + 7(-3) + 5

3(-27) - 4(9) - 21 + 5

-81 - 36 - 21 + 5

= - 133

4 0
3 years ago
What is the only way to increase power of a significance test when lowering the probability of committing a Type I error
Reil [10]

the probability of making a Type I error is equal to the significance level of power. To increase the probability of a Type I error, increase the significance level. Changing the sample size has no effect on the probability of a Type I error.

The electricity of a take a look at can be expanded in a number of methods, for example increasing the pattern length, reducing the standard errors, increasing the difference between the pattern statistic and the hypothesized parameter, or growing the alpha degree.

The chance of creating a kind I mistakes is α, that's the extent of importance you put for your hypothesis check. An α of 0.05 indicates which you are inclined to accept a five% chance which you are incorrect whilst you reject the null hypothesis. To lower this risk, you have to use a decrease cost for α

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2 years ago
A Web music store offers two versions of a popular song. The size of the standard version is 2.9 megabytes (MB). The size of the
aliina [53]

The number of standard version download and high-quality download is 870 and 490 respectively.

<h3>Number of downloads of the high-quality version</h3>

let

  • Number of high-quality download = y
  • Number of standard version = x

x + y = 1360

2.9x + 4.1y = 4532

From (1)

x = 1360 - y

Substitute x = 1360 - y into (2)

2.9x + 4.1y = 4532

2.9(1360 - y) + 4.1y = 4532

3944 - 2.9y + 4.1y = 4532

- 2.9y + 4.1y = 4532 - 3944

1.2y = 588

y = 588/1.2

y = 490

Substitute y = 490 into (1)

x + y = 1360

x + 490 = 1360

x = 1360 - 490

x = 870

So therefore, number of standard version download and high-quality download is 870 and 490 respectively.

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1 year ago
Paige earned 6 points for every 9 books she read
Vikentia [17]
Whats the rest of the question ?
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3 years ago
Find the equivalent expression for (x + 7)(x + 1)​
victus00 [196]

Answer:

x² + 8x + 7

General Formulas and Concepts:

<u>Algebra I</u>

  • Terms/Coefficients/Degrees
  • Expand by FOIL (First Outside Inside Last)

Step-by-step explanation:

<u>Step 1: Define</u>

(x + 7)(x + 1)

<u>Step 2: Expand</u>

  1. Expand [FOIL]:                    x² + x + 7x + 7
  2. Combine like terms:           x² + 8x + 7
3 0
3 years ago
Read 2 more answers
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