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Alecsey [184]
2 years ago
9

21 is 75% fo what number?

Mathematics
2 answers:
const2013 [10]2 years ago
5 0
I believe the answer should be 28.
earnstyle [38]2 years ago
3 0

Answer:

28

Step-by-step explanation:

21 multiplied by 100 divide by 75 gives you 28.

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Suppose that y varies inversely with x. Use the information to find k, and then choose the equation of variation. x = 13 when y
earnstyle [38]

To solve this problem you must apply the proccedure shown below:

1. You have that y varies inversely with x and when x=13 the value of y is y=100.

2. Therefore, you can write the following expression, where k is the constant of proportionality:

y=\frac{k}{x}

3. Solve for the constant of proportionality and substitute the values to calculate it:

k=yx\\ k=(100)(13=\\ k=1300

4. The equation is:

y=\frac{1300}{x}

The answer is: k=1300\\ y=\frac{1300}{x}

6 0
3 years ago
The graphs of $f$ and $g$ are shown. Describe two different transformations from the graph of $f$ to the graph of $g$ . 2 lines
zhenek [66]

Let's convert the word descriptions into mathematical equations first for illustration.

f(x) = x^2 - x - 12

g(x) = -2.5x - 2

Then, we equate g(x) and f(x). The final equation becomes

x^2 - x - 12 = -2.5x - 2

Then, we simplify by transposing and combining like terms.

x^2 - x + 2.5x -12 + 2 = 0

x^2 + 1.5x - 10 = 0

Since this is a quadratic equation, we find the roots by using the quadratic formula

where a = 1, b = 1.5 and c=-10

Thus, the answer is x = 2.5, -4.

5 0
2 years ago
-5/6+2/6=<br> What is the answer to this?
geniusboy [140]

Step-by-step explanation:

Since they have a common denominator the answer is (-5 + 2) / 6 = -3 / 6 = -1/2.

3 0
3 years ago
Read 2 more answers
20 points, IK I put this already but I need to know so I put it as more points.
Alisiya [41]

Answer:

im sorry but if you will show the image that was shown i promise i will answer your question

Step-by-step explanation:i promise

6 0
3 years ago
Today, the price of a new cellphone is $380. In 2010, the price of a similar cellphone was $240. What is the percent of change i
Dahasolnce [82]
36.8% or 37% is the percent change
8 0
3 years ago
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