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Tatiana [17]
3 years ago
9

Solve and explain 4 20 ___ = _____ x - 5 x - 7

Mathematics
1 answer:
Degger [83]3 years ago
8 0
X = 9/2

i hope i have helped you out. simple math for me. :)
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What is 3(5x^2-9x) evaluated for x=-3
Studentka2010 [4]

Answer:

216

Step-by-step explanation:

put -3 where x is

3 ( 5 -3^2 - 9(-3) )

3 ( 45 + 27 )

3 (72)

216

4 0
2 years ago
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Two trains are traveling at a constant rate. Which train has the greater speed?
aniked [119]

AnswerAccording to my caculations its B

Step-by-step explanation:Just trust me

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3 years ago
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According to the data, the mean quantitative score on a standardized test for female college-bound high school seniors was 500.
Sveta_85 [38]

Answer:

6.68% of the female college-bound high school seniors had scores above 575.  

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 500

Standard Deviation, σ = 50

We are given that the distribution of score is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

P(scores above 575)

P(x > 575)

P( x > 575) = P( z > \displaystyle\frac{575 - 500}{50}) = P(z > 1.5)

= 1 - P(z \leq 1.5)

Calculation the value from standard normal z table, we have,  

P(x > 575) = 1 - 0.9332= 0.0668 = 6.68\%

6.68% of the female college-bound high school seniors had scores above 575.

7 0
3 years ago
HELP PLZZ ASAP !! a. The value of x is 6 , what is the value of y?
erastovalidia [21]

Answer:

a). y = 4.5

b) Scale factor = \frac{3}{4}

Step-by-step explanation:

a). Since, polygon Q is the scaled copy of polygon P

    Both the figures will be similar.

    Therefore, their corresponding sides will be proportional.

    \frac{x}{y} =\frac{4}{3}

    If x = 6,

    \frac{6}{y} =\frac{4}{3}

    y = \frac{3\times 6}{4}

    y = 4.5

b). Since, polygon Q is the scaled copy of polygon P,

    Polygon Q will be the image of preimage polygon P.

    Scale factor = \frac{\text{Length of a side of the image}}{\text{Length of a side of the preimage}}

                         = \frac{3}{4}

6 0
3 years ago
Please help fast!! A, B, C or D?
MakcuM [25]

Answer:

the answer would be is 6

4 0
2 years ago
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