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Xelga [282]
2 years ago
7

Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth. 2a2 − 30a + 108 = 0

Mathematics
2 answers:
Liono4ka [1.6K]2 years ago
8 0
The quadratic formula is
- b +  -  \sqrt{ {b}^{2} - 4ac }  \div 2a
A = 2
B = -30
C = 108
plug in the values for the equation and you'll get what the factors are

-(-30)+√(-30)²-4(2)(108))/2(2)

and

-(-30)-√(-30)²-4(2)(108))/2(2)
This will give you your A values
and just round the answers from both of the above equations
il63 [147K]2 years ago
3 0

Two real solutions:


a =(15+√9)/2=(15+3)/2= 9.000


or:


a =(15-√9)/2=(15-3)/2= 6.000



Two solutions were found :

a = 9

a = 6


Processing ends successfully!!!!






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The system on the left can be reduced to: t + u = 9 9t – 9u = –9 Solving the system t= , u=
LenaWriter [7]
We have that
<span>t + u = 9 --------> t=9-u-----------> equation 1
9t – 9u = –9----------> equation 2
</span>
I substitute 1 in 2
9*[9-u]-9u=-9
81-9u-9u=-9
18u=81+9
18u=90
u=90/18---------> u=5
t=9-u------> t=9-5----> t=4

the answer is
u=5
t=4




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2 years ago
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How many 9’s are there between 1 and a 100?
OleMash [197]

Answer:

20

Step-by-step explanation:

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A state becomes good if its people are good justify this statement​
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Step-by-step explanation:

Yes, the statement is true "A state becomes good if its people are good". Government is one of the most important body for the good future of any country. The difference between a good and bad country occurs due to its government and governance. Similarly, citizens plays a vital role for the difference between good and bad state. The literacy rate of a state should be high for the sake of becoming good state.  A state becomes good if its people are good, as they are representative of the state.

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Answer:

Mass of gold bar = 13.896 kg

Step-by-step explanation:

Volume of gold bar = Area of  trapezium x Length of bar

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Area of triangle = 0.5 x 5 x 3 = 7.5 cm²

2 x Area of triangle = 2 x 7.5 = 15 cm²

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Density of gold = 19.3 g/cm³

Mass of gold bar = 720 x 19.3 = 13896 g = 13.896 kg

Mass of gold bar = 13.896 kg

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2 years ago
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the trinomial x2 bx c factors to (x m)(x n). if b is negative and c is positive, what must be true about m and n?
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For c to be positive, and for b to be negative, m must be negative and n must be negative.


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