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wel
3 years ago
12

joanna can buy 15 square yards of carpet for $240 using the same rate how many square yards of carpet can she buy for $320​

Mathematics
1 answer:
Sladkaya [172]3 years ago
8 0

Answer:

x =20

Step-by-step explanation:

We can use proportions to solve

$240         320

----------- = ------------

15                x

Using cross products

240x = 320 * 15

240x =4800

Divide by 240 on each side

240x/240 = 4800/240

x =20

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aleksandrvk [35]
I believe there is a 1/20 chance that Mrs. Galvan will pick a black pin. Since there are 20 pens, each pen has an equal chance of getting picked. For example, you have 2 pens and one of them is blue. The chance of me getting the blue pen is 1/2 or a 50% chance. So your answer will be 1/20 chance.
7 0
3 years ago
The population of Arlington in 2000 was 12,475. In 2010 the population had grown to 17,926. What was the percent increase in the
melisa1 [442]

The formula for percent of increase/decrease:

difference in original and new/original x 100

17926-12475/12475=

5451/12475=

.4369

x 100=

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3 0
3 years ago
8.52 The heights of 2-year-old children are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches
sweet [91]

Answer:

Heights of 29.5 and below could be a problem.

Step-by-step explanation:

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

The heights of 2-year-old children are normally distributed with a mean of 32 inches and a standard deviation of 1.5 inches.

This means that \mu = 32, \sigma = 1.5

There may be a problem when a child is in the top or bottom 5% of heights. Determine the heights of 2-year-old children that could be a problem.

Heights at the 5th percentile and below. The 5th percentile is X when Z has a p-value of 0.05, so X when Z = -1.645. Thus

Z = \frac{X - \mu}{\sigma}

-1.645 = \frac{X - 32}{1.5}

X - 32 = -1.645*1.5

X = 29.5

Heights of 29.5 and below could be a problem.

4 0
2 years ago
Pls help I really don’t understand I’ll be thankful thanks and no links
inysia [295]

Answer:

A: Right

B: Acute

C: Obtuse

D: Acute

Step-by-step explanation:

A: Right

(90 degrees)

B: Acute

(less than 90)

C: Obtuse

(over 90 degrees)

D:  Acute

(less than 90)

6 0
3 years ago
Jane moved from a house with 69 square feet of closet space to an apartment with 40.02 square feet of closet space. What is the
den301095 [7]

Answer:

29.98

Step-by-step explanation:

You subtract the 69 from the 40.02 and ypu get 29.98

8 0
3 years ago
Read 2 more answers
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