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goldfiish [28.3K]
3 years ago
11

I PROMISE BRAINLIST 20 PTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Suppose you are building a brick border for a garden by stacking r

ows of bricks on top of each other. If the height of each brick is 2.5 inches and r represents the number of rows, which algebraic expression would represent the height of the brick wall?
(1 point)
A.)2.5 + r
B.)2.5r + r
C.)2.5
D.)2.5r
Mathematics
1 answer:
avanturin [10]3 years ago
8 0

Answer:

2.5r D is the answer.

Step-by-step explanation:

It is 2.5 r because it makes the most sense for a real world situation like this.

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SAT verbal scores are normally distributed with a mean of 433 and a standard deviation of 90. Use the Empirical Rule to determin
laila [671]

34% of the scores lie between 433 and 523.

Solution:

Given data:

Mean (μ) = 433

Standard deviation (σ) = 90

<u>Empirical rule to determine the percent:</u>

(1) About 68% of all the values lie within 1 standard deviation of the mean.

(2) About 95% of all the values lie within 2 standard deviations of the mean.

(3) About 99.7% of all the values lie within 3 standard deviations of the mean.

$Z(X)=\frac{x-\mu}{\sigma}

$Z(433)=\frac{433-\ 433}{90}=0

$Z(523)=\frac{523-\ 433}{90}=1

Z lies between o and 1.

P(433 < x < 523) = P(0 < Z < 1)

μ = 433 and μ + σ = 433 + 90 = 523

Using empirical rule, about 68% of all the values lie within 1 standard deviation of the mean.

i. e. ((\mu-\sigma) \ \text{to} \ (\mu+\sigma))=68\%

Here μ to μ + σ = \frac{68\%}{2} =34\%

Hence 34% of the scores lie between 433 and 523.

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3 years ago
Kelly earned $20 for babysitting. She has also earned money by doing chores for 5 weeks. Altogether, she has earned $100. How mu
NikAS [45]

Answer:  16

Step-by-step explanation:

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Determine which answer choice matches the dot plot you drew?
Vesnalui [34]

Answer:

C

Step-by-step explanation:

Given data are :

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Then choice B or C or D are possible choices.

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4 appears 2 times so there will be 2 points above number 2 in the dot plot.

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Step-by-step explanation:

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Answer:

I think its 2nd one

HOPE IT HELPS, BE SAFE! Brainiest if possible pls! :)

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