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Maru [420]
3 years ago
12

A new car worth $21,000 is depreciating in value by $3,000 per year. Complete parts (a) through (c) below. a. Write a formula th

at models the car's value, y, in dollars, after x years. y=
Mathematics
1 answer:
IRINA_888 [86]3 years ago
3 0

Answer:

Step-by-step explanation:

If the car's value is going down by 3000 a year, this is a linear function.  Most depreciation is exponential, but no matter.  The steady falling indicates linear.  And the steady rate that it is falling, 3000, is the slope of the line.  You could look at it in terms of 2 coordinate points.  (0, 21000) is one point, where x is the time gone by and y is the value of the car.  This point tells us that when 0 time has gone by, the car is brand new, worth 21000.  Another point could be (1, 18000), where after 1 year, the cars value is 18000.  Using those in the slope formula will give you the slope of the line.

m=\frac{18000-21000}{1-0}=-3000

Now use that slope along with either one of the coordinates to write the equation of the line.  I am going to use (0, 21000) to get

y - 21000 = -3000(x - 0) and

y - 21000 = -3000x + 0 and

y = -3000x + 21000

That is the linear function that models that particular situation.  I do not see a part b and c, so maybe this equation can help you with those parts.

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PLEASE HELP !!!
Wewaii [24]

Answer:

B

Step-by-step explanation:

its quadratic because it has the almost oval-ish shape

3 0
3 years ago
Use the confidence interval to find the estimated margin of error. Then find the sample mean. A biologist reports a confidence i
mash [69]

Complete Question

A biologist reports a confidence interval of (3.5,4.9) when estimating the mean height (in centimeters) of a sample of seedlings. What is the estimated margin of error and the sample mean?

Answer:

The  margin of error is  E = 0.7

The  sample mean is  \=  x  =  4.2

Step-by-step explanation:

from the question we are told that

   The  upper limit is  k  =  4.9

    The  lower limit is  r = 3.5

Generally the margin of error is mathematically represented as

      E =  \frac{k - r}{ 2}

      E = \frac{ 4.9  -  3.5 }{2}

     E = 0.7

Generally the sample mean is mathematically evaluated as

        \=  x = k  -  E

=>    \= x  =  4.9 - 0.7

=>    \=  x  =  4.2

4 0
3 years ago
Directions:Simplify the following monomials.SHOW ALL STEPS!
Mandarinka [93]

Answer:

<u>7. Ans</u>;

\frac{6 {a}^{5}  {b}^{7} }{ - 2 {a}^{3} {b}^{7}  }   =  \frac{2 {a}^{3} {b}^{7}(3 {a}^{2} )  }{ - 2 {a}^{3}  {b}^{7} }  =  - 3 {a}^{2}

___o____o___

<u>8. Ans</u>;

\frac{ - 20 {x}^{3}  {y}^{2} }{ - 5 {x}^{3}y }  =  \frac{ - 5 {x}^{3}y(4y) }{ - 5 {x}^{3}y }  = 4y

___o___o___

<u>9. Ans</u>;

\frac{ - 16 a {b}^{4}  }{4 {b}^{3} }  =  \frac{4 {b}^{3}( - 4ab) }{4 {b}^{3} }  =  - 4ab

____o____o____

<u>10. Ans;</u>

\frac{21 {m}^{8}  {n}^{5} }{27 {m}^{5} {n}^{4}  }  =  \frac{3 {m}^{5} {n}^{4}(7 {m}^{3} n)  }{3 {m}^{5} {n}^{4}(9)  }  =  \frac{7 {m}^{3}n }{9}

___o___o___

<u>11. Ans;</u>

\frac{ - 15 {x}^{5}  {y}^{4} }{45x {y}^{3} }  =  \frac{ 15x {y}^{3} ( -  {x}^{4} y)}{15x {y}^{3}(3) }  =  -  \frac{ {x}^{4}y }{3}

___o___o___

<u>12.Ans;</u>

\frac{7 {p}^{2}  {q}^{2} }{14 {p}^{2} {q}^{2}  }  =  \frac{7 {p}^{2} {q}^{2}  }{7 {p}^{2} {q}^{2} (2) }  =  \frac{1}{2}  = 0.5

I hope I helped you^_^

7 0
2 years ago
Read 2 more answers
1. Dada a função exponencial abaixo, se x=1, qual valor de imagem? * a) 1 b) -2 c) 0 d) -1
andrey2020 [161]

Complete question:

Dada a função exponencial abaixo, se x=1, qual valor de imagem? * a) 1 b) -2 c) 0 d) -1

The function in the image is f(x) = 3^x-1

Answer:

A) 1

Step-by-step explanation:

To solve the exponential function above given that x = 1;

Substitute x = 1 into the exponential function

If x = 1

f(x) = 3^(x - 1)

f(1) = 3^(1 - 1)

f(1) = 3^0

f(1) = 1

4 0
3 years ago
What is 5÷871 Equals two
NeX [460]
871 divided by 5 is 174.2
7 0
3 years ago
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