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3 years ago

Determine the factor of x^2-12x-20

Mathematics

2 answers:

almond37 [142]3 years ago

7 0

there is no GCF and you can’t use the square root method so you must use the quadratic formlula

sveta [45]3 years ago

3 0

Answer:

The roots are: (12 + $\sqrt{224}$ )/2 and (12 - $\sqrt{224}$ )/2

Step-by-step explanation:

We can solve this with the quadratic formula! Plugging it all in, we get (12 +/- $\sqrt{144+80}$ )/2 This simplifies to (12 +/- $\sqrt{224}$ )/2. So the roots of our equation are (12 + $\sqrt{224}$ )/2 and (12 - $\sqrt{224}$ )/2.

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Which one?!!! Help plz

nydimaria [60]

I think number 6 it should be right I think

4 0

3 years ago

Solve: 3 x (3 + 12/3)-4=

Zarrin [17]

Answer:

I get 17.

Step-by-step explanation:

Reduce the fraction:

3 ( 3 + 4 ) - 4

Add the numbers:

3 x 7 - 4

Multiply the numbers:

21 - 4

Subtract the numbers:

5 0

3 years ago

Read 2 more answers

Complete the sentence below with less than,

Gekata [30.6K]

Answer: The Answer is "less than"

Step-by-step explanation:

To find the sum of a series, you find the difference between the first and last term, multiply that by the number of terms, then divide by 2.

For the even numbers, 2 is the first term and 200 is the 100th term (because 2+(100-1)2 is equal to 200). So, (100(2+202)/2 = 10100.

For the odd numbers, 1 is the first term and 201 is the 101th term (because 1+(101-1)2 is equal to 201). So, (101(1+202))/2 = 10251.5.

10100<10251.5 so the sum of the first 100 even numbers is less than the sum of the first odd 101 numbers.

8 0

4 years ago

Read 2 more answers

Find the area. A hexagon with side length 6m.

Crank

Answer:

93.53m.

Step-by-step explanation:

8 0

3 years ago

Scores on a test are normally distributed with a mean of 81.2 and a standard deviation of 3.6. What is the probability of a rand

Misha Larkins [42]

Answer:

The probability of a randomly selected student scoring in between 77.6 and 88.4 is 0.8185.

Solution:

Given, Scores on a test are normally distributed with a mean of 81.2

And a standard deviation of 3.6.

We have to find What is the probability of a randomly selected student scoring between 77.6 and 88.4?

For that we are going to subtract probability of getting more than 88.4 from probability of getting more than 77.6

Now probability of getting more than 88.4 = 1 - area of z – score of 88.4

$\mathrm{Now}, \mathrm{z}-\mathrm{score}=\frac{88.4-\mathrm{mean}}{\text {standard deviation}}=\frac{88.4-81.2}{3.6}=\frac{7.2}{3.6}=2$

So, probability of getting more than 88.4 = 1 – area of z- score(2)

= 1 – 0.9772 [using z table values]

= 0.0228.

Now probability of getting more than 77.6 = 1 - area of z – score of 77.6

$\mathrm{Now}, \mathrm{z}-\text { score }=\frac{77.6-\text { mean }}{\text { standard deviation }}=\frac{77.6-81.2}{3.6}=\frac{-3.6}{3.6}=-1$

So, probability of getting more than 77.6 = 1 – area of z- score(-1)

= 1 – 0.1587 [Using z table values]

= 0.8413

Now, probability of getting in between 77.6 and 88.4 = 0.8413 – 0.0228 = 0.8185

Hence, the probability of a randomly selected student getting in between 77.6 and 88.4 is 0.8185.

4 0

3 years ago