All categories

3 years ago

The company charges $ a0 per hour What is the value of b2 - 4ac for the following equation? x(x + 8) = 9

Mathematics

1 answer:

Mila [183]3 years ago

6 0

Answer:

The value of b² - 4 a c = 100

Step-by-step explanation:

Given equation x(x + 8) = 9

⇒ x² + 8 x = 9

⇒ x² + 8 x - 9 =0

The standard form of quadratic equation

a x ² + b x + c

Here a = 1 , b = 8 , c = -9

The value of b² - 4 a c = ( 8)² - 4 (1)(-9)

= 64 + 36

= 100

Final answer:-

The value of b² - 4 a c = 100

You might be interested in

The regression equation y = -0.414x + 106.55 approximates the percent of people in an audience who finish watching a documentary

Ivahew [28]

The answer is A 67%.. went over this answer in class so it is right.

5 0

3 years ago

Rewrite each fraction with a denominator of 10. a 7 - IN 2 3 IN 5

PolarNik [594]

Answer:

7/2 = 35/10

3/5 = 6/10

Step-by-step explanation:

To get a common denominator of 10, simply multiply the current denominator by any number to equal 10. The first fraction has a denominator of 2. If we divide 10 by 2, we get the answer 5. This means 2 can be multiplied by 5 to get a denominator of 10. However, what we do to the denominator we must also do to the numerator (multiply by 5).

7/2

7 × 5 / 2 × 5

35/10

3/5

3 × 2 / 5 × 2

6/10

brainliest pls

6 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

Four friends bought 2 pizzas and 4 large soft drinks. They shared the cost equally. Each pizza cost

valina [46]

Answer:

$7.85

Step-by-step explanation:

2 pizzas at 11.99=23.98

4 soft drinks at 1.85=$7.40

23.98+7.40=31.38

31.38/4=7.845

Each friend pays $7.845, or $7.85 .........

7 0

2 years ago

When we divide 2√3 by 2√3 it gives 3 how ?(2√3/2√3)

S_A_V [24]

Only if the individual doing the calculation makes a substantial mistake.

Any fraction with the same quantity in the numerator and denominator
always has the value of ' 1 ', (provided only that the quantity is not zero).

6 0

3 years ago

Read 2 more answers