Who can help me out with these questions?

Mathematics

1 answer:

4vir4ik [10]3 years ago

3 0

Hello there! I can help you!

15a. Okay. So each of the two bikes cost $380. One of them has a 50% discount, and the other is 30% off, with another 20% off later. For the first one, all we have to do is multiply by 50% (0.5). For the second one, what we do is multiply by 70%, and then by 80%, because while you get a discount, you still pay a portion of those prices. Keep in mind that 70% (0.7) is multiply by 380, and then the remainder of that number is multiplied by 80% (0.8). If you multiply correctly your answers should be this:

First bike: $190
Second bike: $212.80

15b. Eliza should by the first bike, because the cost of that bike is cheaper. When you subtract the prices, you will see that she will pay $22.80 less if she buys the first bike, compared to the second bike.

16a. Okay. So for this question, the price is marked up by 50%. To find the price that the shoes will be sold, we will multiply by 150%. This is because adding 100% to the markup will help us get straight to the selling price. 57 * 150% (1.5) is 85.5. There. The selling price of the shoes is $85.50.

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Select all the exspressions that are all equivalent to 20 percent of 150

Dmitriy789 [7]

Note: It seems you may have unintentionally missed adding the answer choices. Thus, I am solving your question in general to give you the idea of how the percentage works, which anyways would solve your query.

Answer:

Please check the explanation.

Step-by-step explanation:

Given that we have to determine the expressions which are equivalent to 20 percent of 150.

First, we need to determine what actually 20 percent of 150 really brings.

i.e

20% of 150 = 20/100 × 150

= 30

Thus,

20% of 150 = 30

Therefore, any expression that is equivalent to 30 will be included in the answer to this question.

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2 years ago

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Vinil7 [7]

Answer:

(X-3)^2 - 4

Step-by-step explanation:

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3 years ago

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Ten minus One-third of a number is 4

zloy xaker [14]

Ok, so you automatically know that you are subtracting 6 from 10 to get 4. So, in order to figure out how it is 1/3 of that number, it is going to be multiplied by 3, getting 18. So, the number would be 18.

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3 years ago

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Can someone please explain to me how to do this.

JulijaS [17]

Y = x² - 4x + 4
y = 2x - 4

Find intersection of L and C:
x² - 4x + 4 = 2x - 4
x² - 6x + 8 = 0
 (x - 2)(x - 4) = 0
x = 2 or x = 4

When x = 2 , y = 2(2) - 4 = 0
When x = 4, y = 2(4) - 4 = 4

Points of intersection = A(2, 0) and B(4, 4)

Find the length of AB:

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\text {Length of AB}= \sqrt{(4-0)^2 + (4-2)^2} = \sqrt{16 + 4} = \sqrt{20} = 4.47 \text{ units}$

Answer: 4.47 units

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3 years ago

A rectangle initially has width 7 meters and length 10 meters and is expanding so that the area increases at a rate of 8 square

Tems11 [23]

Answer:

The length of rectangular is increasing at a rate 0.5714 meters per hour.

Step-by-step explanation:

We are given the following in the question:

Initial dimensions of rectangular box:

Length,l = 10 m

Width,w = 7 m

$\dfrac{dA}{dt} = 8\text{ square meters per hour}\\\\\dfrac{dw}{dt} = 40\text{ centimeters per hour} =0.4\text{ meters per hour}$