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nadya68 [22]
3 years ago
14

A sailboat depreciates at 15% of its original value each year. If the sailboat was $9,500 at its time of purchase, what is the v

alue of the sailboat after 7 years?
Mathematics
1 answer:
pentagon [3]3 years ago
4 0

Answer: $ 3045.48

Step-by-step explanation:

The exponential decay equation with rate of growth r in time period t is given by :-

y=A(1-r)^t, where A is the initial amount

Given : The rate of decay of population every year : 15% =0.15

The initial value = $9500

Then , the exponential growth equation in time period t is given by :-

y=9500(1-0.15)^t=9500(0.85)^t

After t= 7 years

The value of the sailboat will be :-

y=9500(0.85)^{7}=3045.48233867\approx3045.48

Hence, the value of the sailboat after 7 years= $3045.48.

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The cost of each ticket at the carnival was $0.25. Li bought $7.50 worth of tickets. How many tickets did she buy?
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Read 2 more answers
Molly's Custom Kitchen Supplies sells handmade forks and spoons. It costs the store $1.70 to buy the
scoray [572]

9514 1404 393

Answer:

  • 7 forks
  • 20 spoons

Step-by-step explanation:

Let x and y represent the numbers of forks and spoons made, respectively.

The cost of materials is ...

  1.70x + 1.30y = 37.90

The revenue from sales is ...

  5.60x + 5.40y = 147.20

You can solve these by any of your favorite methods. A graph is attached. It shows the solution is (x, y) = (7, 20).

They made 7 forks and 20 spoons.

_____

<em>Additional working out</em>

The equation coefficients are not "nice" multiples of each other, so elimination  and substitution will require multiplying both equations by some numbers. If we're going to that trouble, we may as well use Cramer's Rule or a variation of the "cross multiplication method". The latter is relatively straightforward and can be easy to remember. It tells you the solution to ...

  ax +by +c = 0

  dx +ey +g = 0

is ...

  1/(ae-db) = x/(bg-ey) = y/(cd-ga)

Here, that becomes ...

  1/(1.70·5.40-5.60·1.30) = x/(1.30·(-147.20)-5.40·(-37.90))

  = y/(-37.90·5.60-(-147.20·1.70))

  1/1.9 = x/13.3 = y/38

  x = 13.3/1.9 = 7 . . . number of forks

  y = 38/1.9 = 20 . . . number of spoons

__

The above solution formula may be more easily remembered in terms of the cross-multiplication pattern that gives the method its name. When the coefficients are written in two rows of four, with the last being a repeat of the first:

  • a b c a
  • d e g d

each of the three denominators (of 1, x, and y) is the difference of products in adjacent columns, formed in an X fashion: ae-db, bg-ec, cd-ga. Note that the equations are written in "general" form, which is similar to "standard" form, but with all of the non-zero terms on the left of the equal sign. (This has the effect of changing the sign of the constants: 1.7x+1.3y=37.9 ⇒ 1.7x+1.3y-37.9=0)

8 0
2 years ago
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