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PSYCHO15rus [73]
3 years ago
9

What is the answer to this question? Please help and make it quick!

Mathematics
1 answer:
KonstantinChe [14]3 years ago
4 0

Answer:

i believe it would be the las one im pretty sure but not 100% so hope it works and let me know if im right or not but again hope this helps

step-by-step explanation:

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Find the exact value of cos210 using the unit circle
Eduardwww [97]
Cos 210° = cos ( 180° + 30° ) - cos 30° = - √3/2
3 0
3 years ago
Please answer asap. giving brainliest to correct answer.​
nadya68 [22]

Answer:

C.because i calculate it d is the correct answer

Step-by-step explanation:

7 0
2 years ago
Bad gums may mean a bad heart. Researchers discovered that 82% of people who have suffered a heart attack had periodontal diseas
saveliy_v [14]

Answer:

37.27% probability that he or she will have a heart attack.

Step-by-step explanation:

Bayes Theorem:

Two events, A and B.

P(B|A) = \frac{P(B)*P(A|B)}{P(A)}

In which P(B|A) is the probability of B happening when A has happened and P(A|B) is the probability of A happening when B has happened.

In this question:

Event A: Periodontal disease

Event B: Heart attack

Researchers discovered that 82% of people who have suffered a heart attack had periodontal disease, an inflammation of the gums.

This means that P(A|B) = 0.82

Only 33% of healthy people have this disease.

This means that P(A) = 0.33

Suppose that in a certain community heart attacks are quite rare, occurring with only 15% probability.

This means that P(B) = 0.15

If someone has periodontal disease, what is the probability that he or she will have a heart attack

P(B|A) = \frac{0.15*0.82}{0.33} = 0.3727

37.27% probability that he or she will have a heart attack.

6 0
3 years ago
How much paint is needed to paint a house ? Estimate or exact
V125BC [204]

Answer:

One gallon can of paint will cover up to 400 square feet, which is enough to cover a small room like a bathroom. Two gallon cans of paint cover up to 800 square feet, which is enough to cover an average size room. This is the most common amount needed, especially when considering second coat coverage.

Step-by-step explanation:

5 0
3 years ago
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IrinaK [193]

Answer:

A

Step-by-step explanation:

7 0
2 years ago
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