E

Mathematics

1 answer:

Strike441 [17]3 years ago

7 0

Answer:

19.4

Step-by-step explanation:

that is the answer

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Y = 3x + 8<br> 8x + 4y = 12

KIM [24]

You substitute the given value of y into the equation
8x+4(3x+8)=12
Solve the equation for x
x= -1
Substitute the given value of x into the equation y=3x+8
y=3x (-1)+8
Solve the equation for y
y=5

Answer: (x= -1) (y= 5)

7 0

3 years ago

Solve for u in terms of q, r, s, and t.<br> su= -rqt

Anna007 [38]

Answer:

Step-by-step explanation:

su - -rqt

u = -rqt/s

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4 years ago

A bicycle lock requires a two-digit code of numbers 1 through 9, and any digit may be used only once. Which

bekas [8.4K]

Answer:

what math is this

Step-by-step explanation:

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3 years ago

The lengths of pregnancies are normally distributed with a mean of 268 days and a standard deviation of 15 days. If 64 women are

shtirl [24]

Answer:

0.3569 is the probability that they have a mean pregnancy between 266 days and 268 days.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 268 days

Standard Deviation, σ = 15 days

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

Formula:

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

Standard error due to sampling =

$\displaystyle\frac{\sigma}{\sqrt{n}} = \frac{15}{\sqrt{64}} = \frac{15}{8}$

P(pregnancy between 266 days and 268 days)

$P(266 \leq x \leq 268) = P(\displaystyle\frac{266 - 268}{\frac{15}{8}} \leq z \leq \displaystyle\frac{268-268}{\frac{15}{8}}) = P(-1.0667 \leq z \leq 0)\\\\= P(z \leq 0) - P(z < -1.067)\\= 0.5000 - 0.1431 = 0.3569 = 35.69\%$