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3 years ago

7

The relationship between a person's age in years and maximum heart rate in beats per minute can be modeled by the equation y = 2

20 – x, where x is the person's age and y is his or her maximum heart rate. Which of these statements is true according to the model? please i need help ASAP
Answer choices:
A.For each year a person ages, his or her maximum heart rate decreases by 220 beats per minute.
B. For each year a person ages, his or her maximum heart rate increases by 220 beats per minute.
C. For each year a person ages, his or her maximum heart rate decreases by 1 beat per minute.
D.For each year a person ages, his or her maximum heart rate increases by 1 beat per minute

1 answer:

Mademuasel [1]3 years ago

8 0

A. For each year a person ages his or her maximum heart rate decreases by 220 beats per minute.!

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Nostrana [21]

Answer:

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Step-by-step explanation:

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2 years ago

Bobby’s bedroom is 15 feet in length.how long is his bedroom on a scale drawing that uses a scale of 1/2 in = 3 feet

kolezko [41]

Answer:

2.5 or 2 1/2

Step-by-step explanation:

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2 years ago

Mr. Javier purchased a number of pencils for ₱180 and sold all except 6 at a profit of ₱2 per pencil. With the total amount rece

Luba_88 [7]

Answer:

36 pencils

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Step-by-step explanation:

Given

Cost Price = 180

Represent the number of items by x

This implies that the cost of each item is $\frac{x}{180}$

$Selling\ Price = Cost + Profit$

$Selling\ Price = \frac{x}{180} + 2$

Since all but 6 items were sold, the total selling price is:

$Total = (x - 6)(\frac{x}{180} + 2)$

This amount can be used to buy 30 more items.

So, we have:

$(x - 6)(\frac{x}{180} + 2) = x + 30$

Multiply both sides by 180

$180 * (x - 6)(\frac{x}{180} + 2) =180(x + 30)$

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Expand brackets

$x\² + 360x - 6x - 2160 = 180x + 5400$

$x\² + 354x - 2160 = 180x + 5400$

Equate to 0

$x\² + 354x - 180x - 2160 - 5400 = 0$

$x\² + 174x - 7560 = 0$

Expand

$x\² + 210x - 36x - 7560 = 0$

$x(x + 210) - 36(x + 210) = 0$

$(x - 36)(x + 210) = 0$

$x - 36 = 0$ or $x + 210 = 0$

$x = 36$ or $x = -210$

<em>Since, number of items can't be negative, we have to discard x = -210.</em>

Hence:

$x = 36$

<em>We can then conclude that, Mr. Javier purchased 36 pencils</em>

Recall that

$Cost = \frac{x}{180}$

$Cost = \frac{36}{180}$

$Cost = 0.2$

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4 years ago

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ella [17]

Answer:

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Step-by-step explanation:

Equation: (n-2)*180

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2 years ago

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SSSSS [86.1K]

Answer:

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Step-by-step explanation:

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