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postnew [5]
3 years ago
8

The sale price of an item is four-fifths the original price of the item, x.

Mathematics
2 answers:
hammer [34]3 years ago
7 0

Answer:

B. Multiplying by \frac{4}{5} is the same as multiplying by 80%.

Step-by-step explanation:

Let x be the original price of item.

We have been given that the sale price of an item is four-fifths the original price of the item.

Let us find the sale price of item.

\text{Sale price}=\frac{4}{5}x

\text{Sale price}=0.8x

Let us convert 0.8 into percentage by multiplying by 100%.

\text{Sale price}=(0.8)(100\%)x

\text{Sale price}=(80\%)x

Therefore, the sale price of the item could be figured out by  \frac{4}{5}x and 0.8x because Multiplying by \frac{4}{5} is the same as multiplying by 80%.

MrRissso [65]3 years ago
4 0

B. Multiplying by 45 is the same as multiplying by 80%.


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This is pretty open-ended.  How about:

\sqrt 2 and \sqrt 3 are similar because they're both irrational, meaning neither is the ratio of two integers.

\sqrt 2 and \sqrt 3 are different because \sqrt{2} < 1.5} and \sqrt{3} > 1.5.


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Dan will rent a car for the weekend. He can choose one of two plans. The first plan has an initial fee of 53.96
Alja [10]
53.96+0.17x =57.96+0.12x
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3 years ago
girtue goes to the store and buys a rusy car for $55. the store has a sales tax of 5.5% how much will gertue have to pay
galina1969 [7]

Answer:

58.03

Step-by-step explanation:

What I did first to make it easier was make 5.5 to .055 and when you multiply those two together you get 3.025 which if you round it up becomes 3.03 and when you add 55 you get 58.03

5 0
3 years ago
an architect wants to build three similar triangles such that the ratio of the middle triangle. The smallest one has side length
vampirchik [111]

Answer:  15

<u>Step-by-step explanation:</u>

small:     5     12      13

middle:  __   36     39

large:    45   108    117

Notice that to get from the small to the large, multiplied by 9

5(9) = 45    12(9) = 108    13(9) = 117

That is because the sides are proportional \dfrac{5}{45}=\dfrac{12}{108}=\dfrac{13}{117}\rightarrow\dfrac{1}{9}

To get from small to middle, multiply by 3  

5(3) = 15     12(3) = 36    13(3) = 39

To solve it using proportions:

\dfrac{5}{x}=\dfrac{12}{36}\\\\\\\text{Cross Multiply and solve for x:}\\5(36)=12x\\\\\dfrac{5(36)}{12}=x\\\\5(3)=x\\\\\large\boxed{15}=x

7 0
3 years ago
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