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sertanlavr [38]
2 years ago
5

A certain store sells only black shoes and brown shoes. In a certain week, the store sold x black shoes and y brown shoes. If 2/

3 of all shoes sold that week were black, which of the following expressions represents the value of y, in terms of x? A. x/3 B. x/2 C. 2x/3 D. 3x/2 E. 2x
Mathematics
1 answer:
Stolb23 [73]2 years ago
5 0

Answer:

y=\frac{x}{2}

Step-by-step explanation:

Let total x black and y brown shoes are sold in a week

So total number of shoes sold in a week is = x+y

It is given that \frac{2}{3} of all shoes sold are black

So \frac{2}{3}(x+y)=x

y=\frac{x}{2}

So the number of brown shoes sold in a week in terms of black shoes are x/2

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pickupchik [31]

Answer:

Blank 1) 150

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6 0
3 years ago
A squirrel ran 9 miles in 1 hour. Which expression can be used to determine its speed in mile
astraxan [27]

Answer:

9mph

Step-by-step explanation:

Speed = distance/time

Given

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3 years ago
If f(x) = 5x + 4, which of the following is the inverse of Ax)?
Levart [38]

Answer:

f^{-1} (x) = \frac{x-4}{5}

Step-by-step explanation:

let y = f(x) and rearrange making x the subject, that is

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y - 4 = 5x ( divide both sides by 5 )

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change x to f^{-1}(x) and y back to x, thus

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6 0
3 years ago
Determine the 1-unit growth factor for f f. [We encourage you to write the expression that represents the value of the growth fa
timofeeve [1]

Answer: The complete question is found in the attachment

Step-by-step explanation:

a) To determine the 1-unit growth factor for <em>f</em>

= 2.1/1.75 = 1.2

b) To determine the 1-unit percent change for <em>f</em>

<em>=100 x 1-1.2/1 = 0.2 x 100= 20%</em>

<em>c) to determine the initial value of f</em>

<em>f(x)= abˣ , b =1.2   a=initial value</em>

<em>at (-1,2.1)</em>

<em>2.1= (1.2)⁻¹ x a</em>

<em>a = 2.1/(1.2)⁻¹ </em>

<em>a = 2.1 x 1.2 = 2.52</em>

<em />

<em>d) to determine the function formula for f</em>

<em>f(x)= abˣ = 2.52(1.2)ˣ</em>

6 0
3 years ago
There are 20 marbles in the box. 4 marbles are black, 6 marbles are blue, 10 are red. What is the probability of drawing a black
Nitella [24]

Answer:

7/10 or 70% or 0.7

Step-by-step explanation:

4 black, 10 red

10+4=14

now you put it over the total marbles

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i don't know how your teacher wants you to give the answer but it is 7/10 or 0.7 or 70%

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