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daser333 [38]
3 years ago
7

Please solve the following quadratic equation and show your work: x^2 -x =30

Mathematics
1 answer:
saveliy_v [14]3 years ago
8 0
Rewriting the equation as a quadratic equation equal to zero:
     x^2 - x - 30 = 0
We need two numbers whose sum is -1 and whose product is -30. In this case, it would have to be 5 and -6. Therefore we can also write our equation in the factored form
     (x + 5)(x - 6) = 0
Now we have a product of two expressions that is equal to zero, which means any x value that makes either (x + 5) or (x - 6) zero will make their product zero.
     x + 5 = 0  => x = -5
     x - 6 = 0  => x = 6
Therefore, our solutions are x = -5 and x = 6.
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PolarNik [594]

The manufacturer should advertise 13811 pages for each cartridge if it wants to be correct 99% of the time

z-score is the number of standard deviations from the mean value of the reference population

99%=0.99

The z-value associate with 0.99 is 2.33:

2.33 = (X - 12425) / 595:

X - 12425 = 2.33 * 595

X = (2.33 * 595) + 12425

X = 138111

Therefore, The manufacturer should advertise 13811 pages for each cartridge if it wants to be correct 99% of the time

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1 year ago
A rectangle park has been constructed in downtown lilburn the designer wants to put a gravel walkway that cuts diagonally throug
Nutka1998 [239]

Answer:

10

Step-by-step explanation:

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3 years ago
What is this? k/8-5≥-6
ddd [48]

Answer:

k≥-8

Step-by-step explanation:

4 0
3 years ago
please help :) What is 7.7 x 10 to the 8 power written in standard form? A. 770,000,000 B. 77,000,000,000 C. 77,000,000 D. 7,700
Serjik [45]

Answer:

A. 770,000,000

Step-by-step explanation:

7.7x10^8 First step is to simplify

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770,000,000

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3 years ago
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Ivahew [28]

Given:

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Solution:

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Therefore the cross section of the solid shown in the diagram is pentagon.

6 0
3 years ago
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