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horsena [70]
3 years ago
15

Rebecca had 9/10 of a yard of ribbon. Then she gave 7/20 of a yard to a friend. How much does she have left? Explain your work

Mathematics
2 answers:
stiv31 [10]3 years ago
5 0

Answer: \dfrac{11}{20} yards

Step-by-step explanation:

By considering the given information , we have

The total initial length of ribbon = \dfrac{9}{10} yards

The length of ribbon she gave to her friend = \dfrac{7}{20} yards

The length of ribbon she has left = Initial length - Length she gave

=\dfrac{9}{10}-\dfrac{7}{20}

=\dfrac{9\times2}{10\times2}-\dfrac{7}{20} [Multiply 2 on numerator and denominator to the first fraction to make both fractions like.]

=\dfrac{18}{20}-\dfrac{7}{20}

=\dfrac{18-7}{20}=\dfrac{11}{20}

hence, the length of ribbon she has left = \dfrac{11}{20} yards

elena-14-01-66 [18.8K]3 years ago
4 0

rewrite fraction s to have common denominator:

9/10 = 18/20

 now subtract:

18/20 - 7/20 = 11/20 left

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Answer:

y = 4x - 12

Step-by-step explanation:

The equation of a line in slope- intercept form is

y = mx + c ( m is the slope and c the y- intercept )

Calculate m using the slope formula

m = \frac{y_{2}-y_{1}  }{x_{2}-x_{1}  }

with (x₁, y₁ ) = E(4, 4) and (x₂, y₂ ) = F(2, - 4)

m = \frac{-4-4}{2-4} = \frac{-8}{-2} = 4 , then

y = 4x + c ← is the partial equation

To find c substitute either of the 2 points into the partial equation

Using (4, 4), then

4 = 16 + c ⇒ c = 4 - 16 = - 12

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3 0
3 years ago
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Give the least common multiple: 3a, 15 _____
stiks02 [169]

Answer:

Answer: LCM of 3 and 15 is 15. 2.

Step-by-step explanation:

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2 years ago
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For f(x) = -4x+2 find f(x) when x = -1 A. -2. B. 6 C. -4 D. 2
djverab [1.8K]

Answer:

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2 years ago
In a bag of candy, Marsha found that there were 7 red, 8 blue, 5 yellow, and 9 greens pieces of candy. Marsha put all of the pie
son4ous [18]

Answer:

Step-by-step explanation:

1) find the total candies

7 + 8 + 5 + 9 = 29

2) a probability can be expressed with a fraction whose denominator is the total candies, while the numerator represents the candies that we want to find

- red = 7/29

- blue = 8/29

- yellow = 5/29

- green = 9/29

3) compound probability

(red + blue)/29 = 15/29

(yellow + green)/29 = 14/29

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7 0
2 years ago
The variable y is directly proportional to the variable x. If y = 32 when x = 20, what is the value of x when y = 40?
elena55 [62]

Answer:

The Correct option is C ) 25

Therefore the value of x is 25 when y =40.

Step-by-step explanation:

Given:

Variable 'y' is directly proportional to the variable 'x'.

\therefore y=kx     ......Direct Variation

Where,

k = Constant of proportionality

To Find:

value of x = ? when y = 40

Solution:

First we need to find Constant of proportionality

When x = 20 and y = 32

Substituting the values we get

32=k\times 20\\k=\dfrac{32}{20}=1.6\\\\k=1.6

Now when k =1.6 , y = 40 then x will be

40=1.6\times x\\\\x=\dfrac{40}{1.6}=25\\\\x=25

Therefore the value of x is 25 when y =40.

6 0
3 years ago
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