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2 years ago

Algebra 1 (100 points) Look at screen shot

Mathematics

2 answers:

yKpoI14uk [10]2 years ago

8 0

Answer:

Lin has provided the correct answer.

Step-by-step explanation:

The equation has two roots as a quadratic equation.

Elena's solution ends up with loss of one of the roots when cancelling the variable.

Lin gets two roots, so she is correct.

GarryVolchara [31]2 years ago

4 0

Answer:

Lin gave Correct answer

Step-by-step explanation:

Let's solve by ourselves once

x²=7x
x²-7x=0
x(x-7)=0
x=0,7[/tex]

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A roofing company claims they can haul away 755.2 hectograms of shingles every 90 minutes for trash. If they worked for 39 hours

Marina CMI [18]

<h2><u>Answer:</u></h2>

The roofing company can take out <u>196.352kg</u> of shingles.

<h2><u>Step-by-step explanation:</u></h2>

First, work out how many 90 minutes are in 39 hours:

39 x 60 = 2340 minutes total

2340 ÷ 90 = <u>26</u>

Then, multiply this by 755.2 to work out how much hectograms of trash is taken out.

26 x 755.2 = <u>19635.2 hectograms of trash</u>

Finally, divide this by 10 to work out how many kilograms this is:

19635.2 ÷ 10 = <u>196.352kg</u>

8 0

3 years ago

Which number is IRRATIONAL? A) 64 B)81 C) 96 D) 144

sdas [7]

96 because it is the only one that cant be rooted evenly

7 0

3 years ago

(y^4 – y^3 + 2y^2 + y – 1) ÷ (y^3 + 1)<br> DO NOT INCLUDE PARENTHESES IN YOUR ANSWER

jarptica [38.1K]

Use long division.

y - 1
-------------------------------
y³+1 | y⁴ - y³ + 2y² + y - 1
y⁴ + y
-------------------------------
- y³ + 2y² - 1
- y³ - 1
---------------------------
2y²

Answer: y - 1 + 2y2 ÷ y³+1

Note:
The correct answer should be written with parenthesis, as y - 1 + y²/(y³+1) in order to avoid ambiguity.

8 0

4 years ago

If a restaurant bill totals $85,what amount should be left as 15% tip

masya89 [10]

<span>We can quickly calculate a ten percent tip by moving the decimal place one to the left. So a 10% tip on $85.00 would be $8.50. We can then take half of that tip to calculate the remaining 5%. $8.50 / 2 = $4.25. The sum of these two results is equal to a 15% tip. $8.50 + $4.25 = $12.75. The correct answer is D.</span>

5 0

3 years ago

In a sample of 1100 U.S. adults, 208 think that most celebrities are good role models. Two U.S. adults are selected from this s

DedPeter [7]

Answer:

a) 3.56% probability that both adults think most celebrities are good role models.

b) 65.74% probability that neither adult thinks most celebrities are good role models.

c) 34.26% probability that at least one of the two adults thinks most celebrities are good role models.

Step-by-step explanation:

A probability is the number of desired outcomes divided by the number of total outcomes.

The order in which the adults are chosen is not important. So we use the combinations formula to solve this question.

Combinations formula:

$C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

(a) Find the probability that both adults think most celebrities are good role models.

Desired outcomes:

Think most celebrities are good role models, so 2 from a set of 208. Then

$D = C_{208,2} = \frac{208!}{2!(208-2)!} = 21528$

Total outcomes:

Two adults from a set of 1100. Then

$T = C_{1100,2} = \frac{1100!}{2!(1100-2)!} = 604450$

Probability:

$p = \frac{D}{T} = \frac{21528}{604450} = 0.0356$

3.56% probability that both adults think most celebrities are good role models.

(b) Find the probability that neither adult thinks most celebrities are good role models.

Desired outcomes:

2 from a set of 1100 - 208 = 892. Then

$D = C_{892,2} = \frac{892!}{2!(892-2)!} = 397386$

Total outcomes:

Two adults from a set of 1100. Then

$T = C_{1100,2} = \frac{1100!}{2!(1100-2)!} = 604450$

Probability:

$p = \frac{D}{T} = \frac{397386}{604450} = 0.6574$

65.74% probability that neither adult thinks most celebrities are good role models.

(c) Find the probability that at least one of the two adults thinks most celebrities are good role models.

Either neither think, or at least one does. The sum of the probabilities of these events is 100%.

From b), 65.74% probability that neither think.

65.74 + p = 100

p = 100 - 65.74

p = 34.26

34.26% probability that at least one of the two adults thinks most celebrities are good role models.

8 0

3 years ago