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marshall27 [118]
3 years ago
15

What are the solutions of x^2=8-5x?​

Mathematics
1 answer:
Aleksandr [31]3 years ago
7 0

Answer:

x = (-5 ± √57) / 2

Step-by-step explanation:

x² = 8 − 5x

x² + 5x − 8 = 0

Solve with quadratic formula:

x = [ -b ± √(b² − 4ac) ] / 2a

x = [ -5 ± √(25 − 4(1)(-8)) ] / 2

x = (-5 ± √57) / 2

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Cho surveyed a random sample of 60 students in the school's library about whether they read the newest magazine. Fifteen of the
Softa [21]

Answer:

90 students.

Step-by-step explanation:

Given that Cho surveyed a random sample of 60 students in the school's library, of which 15 said they read the newest magazine, and that a total of 360 students attend the library every day, to determine how many of the 360 students can have expect to read the newest magazine the following calculation should be performed:

60 = 100

15 = X

15 x 100/60 = X

1,500 / 60 = X

25 = X

Thus, 25 percent of the students in the sample read the newest magazine. Since 25% of 360 is 90 (360 x 0.25), that is the number of students he can expect to have read the magazine.

8 0
3 years ago
a woman put $580 into a savings account for one year. the rate of interest on the account was 61 1/2%. how much was the interest
kogti [31]

The amount of interest earned from a specific investment can be calculated by multiplying the principal amount with the decimal equivalent of the given percentage or interest rate. That is,

 

<span>   I = P x i</span>

 

Substituting the known values,

<span> I = ($580)(0.615)</span>

<span> I = $356.7</span>

<span>Answer: $356.7</span>

4 0
3 years ago
100 points help llease
sergey [27]
The correct it is b this I hope this helps you
7 0
3 years ago
Read 2 more answers
What is the advantage of using<br> scientific names, instead of common<br> names?
Aleksandr-060686 [28]

Answer:

the scientific name is the same name around the world and if you use common names they are different around the world

Step-by-step explanation:

8 0
3 years ago
A square piece of plastic has a perimeter of 8 cm. how long is each side of the piece of plastic?​
Aleksandr-060686 [28]

Answer:

Step-by-step explanation:

Since it is a square, all four sides are equal and its perimeter is just

P=4s, so if P=8 then

4s=8, dividing each side by 4 we get

s=2

So each side of the plastic square is 2 centimeters.

8 0
3 years ago
Read 2 more answers
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