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Anna007 [38]
3 years ago
5

Which expression has a value of 90?

Mathematics
2 answers:
ratelena [41]3 years ago
8 0

Answer:

1. 73.2

2. 90

3. 80

4. 80

Step-by-step explanation:

you will have to divide 3,600 by 50

Lerok [7]3 years ago
5 0

Answer:

None of them...

Step-by-step explanation:

3,600 ÷ 50 = \frac{1}{4}

5,400 ÷ 60  = \frac{3}{4}

6,400 ÷ 80  = \frac{6}{5}

7,200 ÷ 90 = \frac{63}{20}

Did you read the problem correctly?

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Which equation represents the line that passes through the point (2, 5) and has a slope of 4?
inysia [295]

Answer:

A. y-5=4(x-2)

Step-by-step explanation:

6 0
2 years ago
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Bad gums may mean a bad heart. Researchers discovered that 81% of people who have suffered a heart attack has periodontal diseas
IgorC [24]

Answer:

0.405 or 40.5%

Step-by-step explanation:

Let event A=having a periodontal disease

event B=having a heart attack

we are given

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P(B)=P(having a heart attack)=0.15

P(A/B)=P(have a periodontal disease/have a heart attack)=0.81

P(B/A)=P(have a heart attack/have a periodontal disease)=?

P(A/B)=P(A∩B)/P(B)

P(A∩B)=P(B)*P(A/B)=0.15*0.81=0.1215

P(B/A)=P(A∩B)/P(A)=0.1215/0.3=0.405

There is 40.5% probability that if someone has periodontal disease will have a heart attack.

7 0
2 years ago
15 points. Would the rules for interference work the same for light waves as they do for sound waves? Explain why or why not.
Vilka [71]

Answer:

Yes, because when waves are at the same place at the same time, the amplitudes of the waves simply add together and this is really all we need to know!

Step-by-step explanation:

The sum of two waves can be less than either wave, alone, and can even be zero. This is called destructive interference.

If we place the waves side-by-side, point them in the same direction and play the same frequency, we will have  constructive interference.

8 0
3 years ago
What is the sales tax on a $8.50 purchase if the sales-tax rate is 6.5% (6 1/2 %)?
konstantin123 [22]
The answer is $0.55

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x is 6.5%

8.50 : 100% = x : 6.5%
x = 8.50 : 100% * 6.5%
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Step-by-step explanation:

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