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zzz [600]
3 years ago
9

What number should be added on both sides of the equation to complete the square?x^2-10x=7

Mathematics
1 answer:
ArbitrLikvidat [17]3 years ago
3 0
<span>What number should be added on both sides of the equation to complete the square is (-10/2)^2 or (10/2)^2 or 5^2 or 25.</span>
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Bad gums may mean a bad heart. Researchers discovered that 80% of people who have su ered a heart attack had periodontal disease
saul85 [17]

Answer:

0.069 = 6.9% probability that he or she will have a heart attack

Step-by-step explanation:

Conditional Probability

We use the conditional probability formula to solve this question. It is

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

In which

P(B|A) is the probability of event B happening, given that A happened.

P(A \cap B) is the probability of both A and B happening.

P(A) is the probability of A happening.

In this question:

Event A: Does not have periodontal disease

Event B: Has a heart attack.

Probability of not having a periodontal disease:

100 - 80 = 20% of 10%(had a heart attack).

30% of 100-10 = 90%(did not have a heart attack). So

P(A) = 0.2*0.1 + 0.3*0.9 = 0.29

Intersection of A and B:

Not having the disease, suffering a heart attack, so 20% of 10%.

P(A cap B) = 0.2*0.1 = 0.02

What is the probability that he or she will have a heart attack?

P(B|A) = \frac{P(A \cap B)}{P(A)} = \frac{0.02}{0.29} = 0.069

0.069 = 6.9% probability that he or she will have a heart attack

6 0
3 years ago
Monica earned $60 from a bonus plus $8.50 per hour (h) she worked this week. Which of the following expressions best represents
maria [59]
60 +8.50 x 24 x 7 = ?
3 0
2 years ago
Read 2 more answers
How do u express a ratio as a decimal
Viktor [21]
Perform the indicated division ... divide the numerator by the denominator.
The quotient is the decimal form of the ratio.
6 0
3 years ago
A camera attached to a telescope photographs a stars image once every .045 seconds. How many complete images can the camera capt
padilas [110]
Writing and solving an equation of ratios would seem to be the best way to go.

0.045 sec       3 sec
------------- = ------------
1 image           x

Then 0.045x = 3, and x = 66 2/3 images, best rounded down to  66 images.

4 0
2 years ago
One-half of a roll of wallpaper covers 1/10th of a wall. How many rolls of wallpaper are needed to cover half the wall? (a) 2/10
WARRIOR [948]

Answer:

  2 1/2 rolls

Step-by-step explanation:

rolls : walls = (1/2) : (1/10) = ? : (1/2) = 5/2 : 1/2 (multiply by 5, since 1/2 = 5/10)

It takes 5/2 rolls = 2 1/2 rolls to cover half the wall.

3 0
3 years ago
Read 2 more answers
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