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3 years ago

I don’t understand this! Please help!

Mathematics

1 answer:

nignag [31]3 years ago

7 0

Answer: y=-5/3x+8

Step-by-step explanation:

Hope this helped!:)

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Starting with the standard form of an equation ax + by = c, solve this expression for y in terms of a, b, c, and x. then put the

Vika [28.1K]

Ax+by=c
a=(-by+c)/x
b=(-ax+c)/x
c=ax+by
x=(-by+c)/a
y=(-ax+c)/b. or y= -a/b x + c/b which is slope intercept form

4 0

3 years ago

A set of city temperatures in April are normally distributed with a mean of 19.7 degrees Celsius and a standard deviation of 2 d

Sati [7]

Answer:

19.77% of average city temperatures are higher than that of Cairo

Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore 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 pvalue, we get the probability that the value of the measure is greater than X.

In this question, we have that:

$\mu = 19.7, \sigma = 2$

What percentage of average city temperatures are higher than that of Cairo?

This is 1 subtracted by the pvalue of Z when X = 21.4.

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

$Z = \frac{21.4 - 19.7}{2}$

$Z = 0.85$

$Z = 0.85$ has a pvalue of 0.8023

1 - 0.8023 = 0.1977

19.77% of average city temperatures are higher than that of Cairo

6 0

3 years ago

A restaurant needs pound 7/8 of cinnamon. The price of cinnamon is $20 per pound. How much does the restaurant spend on cinnamon

Lorico [155]

Answer:

$17.50

Step-by-step explanation:

Multiply 7/8 by 20/1, to find 7/8 of $20.00.

7/8 × 20/1 = 140/8

140 ÷ 8 = 17.5

Once you convert to money, this is $17.50.

4 0

2 years ago

Julie has 21 colored pencils and 27 crayons. What is the ratio of crayons to colored pencils?

Andreas93 [3]

It is most likely looking for a simplified version of the answer

Based off that assumption it would be

9:7

3 0

3 years ago

Subtract 60 from the sum of 8e and 20 when e=7

Diano4ka-milaya [45]

Answer:

Subtract 60 from the sum of 8e and 20 when e=7

8e +20

8(7) + 20

56+20=76

76-60=16

8 0

3 years ago