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3 years ago

What is x in 3x - 7 = 11

Mathematics

2 answers:

Darina [25.2K]3 years ago

8 0

The answer is 6 :)))

Anna35 [415]3 years ago

3 0

Answer:

x = 6

Step-by-step explanation:

3x - 7 = 11

3x = 11 + 7

3x = 18

x = 6

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Find the values of x and y. 63 X у 60 X y =

blondinia [14]

Answer:

Step-by-step explanation:

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3 years ago

Find the limits of integration ly, uy, lx, ux, lz, uz (some of which will involve variables x,y,z) so that ∫uz lz∫uxlx∫uyly????y

SSSSS [86.1K]

Answer:

X from 0 to 21

Y from 0 to 7

Z from 0 to 3

Step-by-step explanation:

Since we are being asked by the integration limits in first octant (positive x, positive y and positive z) we need to know where does the plane intersect this axes. For this we have:

for x=0 and y=0

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z=3

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3y=21

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4 years ago

Urgant !! 3(2x-4) - 6(x-3) please provide explanation

DIA [1.3K]

3(2x - 4) - 6(x - 3)
Distribute the 3 and the -6
6x - 12 -6x + 18
Combining like terms the expression simplifies to 6

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3 years ago

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Tickets for an amusement park cost $10 for adults and 6 for children find the total cost of 2 adults and 3 children

wolverine [178]

It would be $38 total, because it would be 20 for the adults and 18 for the children

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3 years ago

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Suppose that time spent on hold per call with customer service at a large telecom company is normally distributed with a mean µ

lana66690 [7]

Answer:

0.3108 is the probability that the sample mean is between 7.8 and 8.2 minutes.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 8 minutes

Standard Deviation, σ = 2.5 minutes

Sample size, n = 25

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

Formula:

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

Standard error due to sampling =

$=\dfrac{\sigma}{\sqrt{n}} = \dfrac{2.5}{\sqrt{25}} = 0.5$

P(sample mean is between 7.8 and 8.2 minutes)

$P(7.8 \leq x \leq 8.2)\\\\ = P(\displaystyle\frac{7.8 - 8}{0.5} \leq z \leq \displaystyle\frac{8.2-8}{0.5})\\\\ = P(-0.4 \leq z \leq 0.4})\\\\= P(z < 0.4) - P(z < -0.4)\\\\= 0.6554 -0.3446= 0.3108$

0.3108 is the probability that the sample mean is between 7.8 and 8.2 minutes.

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4 years ago