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4 years ago

28is what percent of 40

2 answers:

7 0

Step 1.) Set up the equation

28 %
---- = ------
40 100

Step 2.) Multiply the cross products

2800 = 40x
-------- ------
40 40

70% = x

Ket [755]4 years ago

3 0

I actually created my own trick to find the answer to these problems. (Only works if both numbers are double digits, and if it is a "# is what percent of #" equation

Change the first number (28) by placing a decimal in the middle
2.8
Then divide 2.8 by 40
2.8 ÷ 40 = 0.07
Now multiply by 1000
0.07 x 1000 = 70
70% is your answer

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Consider the following function.

MakcuM [25]

Answer:

if f(x) = ax + b then f-1(x) = (x - b)/a

Step-by-step explanation:

Now

f(x)=ax + b

then y = ax + b

interchanging x and y , we get

or, x = ay + b

or, x - b = ay

or, (x - b)/a = y

therefore,f-1(x) = (x - b)/a

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3 years ago

A retail shop is replacing their flooring with laminate wood. The floor plan is shown below. Determine the total square feet of

almond37 [142]

Answer:

1075 ft

Step-by-step explanation:

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3 years ago

The value of a precious gem stone has increased at a rate of 105% each year. If the gem"s value started at $10 in 1995 ,How much

Pachacha [2.7K]

2,014−1,995=19years
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3 years ago

Find the slope for each line. And can you show me how you did it.

Oksi-84 [34.3K]

Answer:

1 : -1

2:2

3:-5

4: 1/2

5: -3

6: -3/2

7: 1/2

8: -1/2

9: 1

10: 1/3

Step-by-step explanation:

well all u have to do is do rise over run, rise/run. find 2 points and go up according to how much it goes up and go left or right based on the graph. AND sometimes the slope will be negative like number 1.

8 0

4 years ago

The Census Bureau reports that 82% of Americans over the age of 25 are high school graduates. A survey of randomly selected resi

SVETLANKA909090 [29]

Answer:

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Step-by-step explanation:

Problems of normally distributed samples can be 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

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

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. Subtracting 1 by the pvalue, we This p-value is the probability that the value of the measure is greater than X.

(a) Find the mean and standard deviation for the number of high school graduates in groups of 1210 Americans over the age of 25.

This first question is a binomial propability distribution.

We have a sample of 1210 Amricans, so $n = 1210$ .