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omeli [17]
3 years ago
5

If the cost see for manufacturing X units of a certain product is given by C=X squared +25X +40 find the number of units manufac

tured at a cost of 9390

Mathematics
1 answer:
grandymaker [24]3 years ago
6 0

Answer:

  85 units

Step-by-step explanation:

Fill in the given value and solve for x.

  c = x² +25x +40

  9390 = x² +25x + 40

  x² +25x -9350 = 0 . . . . . . rearrange to standard form

  (x +110)(x -85) = 0 . . . . . . . factor the quadratic

The positive solution is the value of x that makes a factor be zero: x = 85.

The number of units manufactured at a cost of 9390 is 85 units.

_____

There are several ways you can solve the quadratic. There appear to be no restrictions here, so we used a graphing calculator to assist. It shows the zeros of the equation to be -110 and +85, so the factors are as shown above.

__

The prime factorization of 9350 is ...

  9350 = 2 · 5² · 11 · 17

so there are 24 divisors:

  1, 2, 5, 10, 11, 17, 22, 25, 34, 50, 55, 85, 110, 170, 187, 275, 374, 425, 550, 850, 935, 1870, 4675, 9350

We're looking for two factors that differ by a relatively small amount, so we would start with the factors near the middle of this list:

  9350 = 85·110 . . . . . these differ by 25, so are the factors of interest

These let you rewrite the 25x term so you can factor by grouping:

  x² +110x -85x +9350 = 0 . . . . rewrite the middle term

  x(x +110) -85(x +110) = 0 . . . . . factor each pair of terms

  (x -85)(x +110) = 0 . . . . . . . . . . factor out the common factor

The solution of interest is x = 85.

__

You can also "complete the square"

  x² +25x = 9350

  x² +25x + 156.25 = 9506.25

  (x² +12.5) = 97.5² . . . . . rewrite as squares

  x = 97.5 -12.5 = 85 . . . . take the positive square root

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The largest side of a triangle is six more units than the smallest side. The third side is twice the smallest side. If the perim
svetlana [45]
Equation:     x + x + 6 = 2x = 25
smallest side is    4.75 units
largest size is      4.75 + 6 = 10.75 units
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smallest side is    x 
largest size is      x + 6
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-----------------------------------
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x = 4.75 is the smallest side


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Last month, you worked 41 hours the first week, 49 hours the second week, 48 hours the third week, and 46 hours the last week. F
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A true-false question is to be posed to a husband and wife team. Both the husband and the wife will give the correct answer with
marysya [2.9K]

Answer:

Choose either strategy both are equally successful

Step-by-step explanation:

Given:-

- The probability of success for both husband (H) and wife (W) are:

                              P ( W ) = 0.8 , P ( H ) = 0.8

Find:-

- Which of the following is a better strategy for the couple?

Solution:-

Strategy 1

- First note that P ( W ) & P ( H ) are independent from one another, i.e the probability of giving correct answer of husband does not influences that of wife's.

- This strategy poses an event such that either wife knows the answer and answer it correctly or the husband knows and answers in correctly.

- We will assume that probability of either the husband or wife knowing the answer is 0.5 and the two events of knowing and answering correctly are independent. So,

                           P ( Wk ) = P (Hk) = 0.5

- The event P(S1) is:

                           P(S1) = P ( Hk & H ) + P ( Wk & W )

                           P(S1) = 0.5*0.8 + 0.5*0.8

                           P(S1) = 0.8

- Hence, the probability of success for strategy 1 is = 0.8

Strategy 2

- Both agree , then the common answer is selected otherwise, one of their answers is chosen at random.

- The success of strategy 2, will occur when both agree and are correct, wife is correct and answers while husband is not or husband is correct and he answers.

- The event P(S2) is:

                   P(S2) = P ( H & W ) + P ( H / W' & Hk ) + P ( H' / W & Wk )

                   P(S2) = P ( H & W ) + P ( H / W') P ( Hk ) + P ( H' / W) P (Wk)

                   P(S2) = P ( H & W ) + P ( H / W')*0.5  + P ( H' / W)*0.5

                   P(S2) = 0.5* [ P ( H & W ) + P ( H / W') ]  + 0.5* [ P ( H' / W) + P ( H & W )]

                   P(S2) = 0.5*P(H) + 0.5*P(W)

                   P(S2) = 0.5*0.8 + 0.5*0.8

                   P(S2) = 0.8

- Hence, the probability of success for strategy 2 is = 0.8

Both strategy give us the same probability of success.

                 

                       

4 0
3 years ago
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