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3 years ago

You take a test with 25 questions. Your grade on the test was a 80%. How many questions did you get right?

Mathematics

2 answers:

Vadim26 [7]3 years ago

3 0

Answer: 20 questions
Explanation: 25 divided by 20 = 80%

professor190 [17]3 years ago

3 0

Answer:

20 questions

Step-by-step explanation:

1.) Use the following equation:

$\frac{x}{y}$ = $\frac{p}{100}$

2.) For this equation,

x is the # of test question you got right
y is the total # of test questions
p is the grade you got on the test

3.) Substitute

$\frac{x}{25}$ = $\frac{80}{100}$

4.) Solve

$\frac{x}{25}$ = $\frac{80}{100}$

$\frac{x}{25}$ = $\frac{8}{10}$

$\frac{x}{25}$ = $\frac{4}{5}$

5.) Cross Multiply

$\frac{x}{25}$ = $\frac{4}{5}$

5x = 100

6.) Divide

5x = 100

x = 20

Therefore, you got 20 questions right.

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-2xy^2(x^3y-2x^2y^2+5xy^3)

SSSSS [86.1K]

Step-by-step explanation:

(((2•(x2))•y)-(5x•(y2)))-3y3

(((2 • (x2)) • y) - 5xy2) - 3y3

((2x2 • y) - 5xy2) - 3y3

2x2y - 5xy2 - 3y3 = y • (2x2 - 5xy - 3y2)

5.2 Factoring 2x2 - 5xy - 3y2

Found a factorization : (x - 3y)•(2x + y)

Final result :

y • (x - 3y) • (2x + y)

8 0

3 years ago

Can you pleaseee help meee

Mrac [35]

Yesssssssss, with what though

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3 years ago

Explain why functions with the property f(–x) = –f(x) are called odd functions and functions with the property f(–x) = f(x) are

anastassius [24]

Answer:

The functions with the property f(–x) =f(x) are called even functions because they symmetric about the y-axis and The functions with the property f(–x) = -f(x) are called odd because these function are symmetric about the origin .

Step-by-step explanation:

The functions with the property f(–x) =f(x) are called even functions because they symmetric about the y-axis . In other words these functions usually take a form x^2 ,x^4 ,x^6 ,x^8 etc . However ,there are other functions that behave like that too, such as cos(x).An even exponent does not always make an even function, for example (x+1)^2 is not an even function .

The functions with the property f(–x) = -f(x) are called odd because these function are symmetric about the origin . In other words they are called odd because of the functions like x, x^3 ,x^5 ,x^7, etc .but there are other functions that behave like that, too, such sin(x) .but an odd exponent does not always make an odd function, for example x3+1 is not an odd function.

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3 years ago

5 positive integers are arranged in ascending order, as follows:

LekaFEV [45]

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Mark brainliest please

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3 years ago

Write a function that models the distance D from a point on the line y = 9 x - 8 to the point (0,0) (as a function of x).

lakkis [162]

The function that models the distance D from a point on the line y = 9 x - 8 to the point (0,0) (as a function of x) is y = 9x

Given the equation of a line in standard form as y = 9x - 8

Get the slope of the line

mx = 9x

m = 9

Since the line passes through the origin (0, 0), substitute the slope and the point in the point-slope form of the equation as shown below:

$y-y_0=m(x-x_0)$

$y-0=9(x-0)\\y =9x$

Hence the function that models the distance D from a point on the line y = 9 x - 8 to the point (0,0) (as a function of x) is y = 9x

Learn more here: brainly.com/question/15816805

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3 years ago