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lesya692 [45]
2 years ago
5

Diego has two jobs. He works 3 hours at the library each day, making $8 per hour. In addition, he works at a coffee shop, making

$7.50 per hour. At the coffee shop, he works more than 4 hours but less than 7 hours
each day Diego needs to make at least $70 daily to afford his living expenses.
Which of the following systems represents the constraints given in this scenario?
Let I represent the number of hours he works at the library
and c represent the number of hours he works at the coffee shop.

A: l = 3
4 < c < 7
8l + 7.50 ≥ 70

B: l = 3
4 ≤ c ≤ 7
8l + 7.50 ≥ 70

C: 1 = 3
4 ≤ c ≤ 7
7.50l + 8c ≤ 70

D: 1=3
4 < c < 7
7.50l + 8c ≥ 70
Mathematics
1 answer:
Zepler [3.9K]2 years ago
3 0

Answer:

  • D.  l = 3  ||  4 < c < y   ||  8l + 7.5c ≥ 70

Step-by-step explanation:

<h3>Work at library</h3>
  • Time  = 3 hours ⇒ l = 3
  • Payment = $8 per hour
  • Total payment = 8l
<h3>Work at coffee shop</h3>
  • Time = between 4 and 7 hours ⇒ 4 < c < 7
  • Payment = $7.5 per hour
  • Total payment = 7.5c

Target income = at least $70 daily  

<u>So the system as per above parameters:</u>

  • l = 3
  • 4 < c < y
  • 8l + 7.5c ≥ 70

Correct option is D

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Find the product of the expression:<br> (5p^3) (-1m^8p^2)
Rainbow [258]

Answer:

We conclude that:

  • \left(5p^3\right)\:\left(-1m^8p^2\right)=-5p^5m^8

Step-by-step explanation:

Given the expression

\left(5p^3\right)\:\left(-1m^8p^2\right)

Apply the rule:

a\left(-b\right)=-ab

so the expression becomes

\left(5p^3\right)\left(-1\cdot \:m^8p^2\right)=-5p^3\cdot \:1\cdot \:m^8p^2

Apply the rule:

a^b\cdot \:a^c=a^{b+c}

so the expression becomes

                             =-5p^{3+2}\cdot \:1\cdot \:m^8         ∵ p^3p^2=p^{3+2}

                             =-5p^5\cdot \:1\cdot \:m^8

                             =-5p^5m^8

Therefore, we conclude that:

  • \left(5p^3\right)\:\left(-1m^8p^2\right)=-5p^5m^8
7 0
2 years ago
Can you find a strategy for splitting any number so that you always get the largest product?
Alex

9514 1404 393

Answer:

  split the number into equal pieces

Step-by-step explanation:

Assuming "splitting any number" means identifying parts that have the number as their sum, the maximum product of the parts will be found where the parts all have equal values.

We have to assume that the number being split is positive and all of the parts are positive.

<h3>2 parts</h3>

If we divide number n into parts x and (n -x), their product is the quadratic function x(n -x). The graph of this function opens downward and has zeros at x=0 and x=n. The vertex (maximum product) is halfway between the zeros, at x = (0 + n)/2 = n/2.

<h3>3 parts</h3>

Similarly, we can look at how to divide a (positive) number into 3 parts that have the largest product. Let's assume that one part is x. Then the other two parts will have a maximum product when they are equal. Their values will be (n-x)/2, and their product will be ((n -x)/2)^2. Then the product of the three numbers is ...

  p = x(x^2 -2nx +n^2)/4 = (x^3 -2nx^2 +xn^2)/4

This will be maximized where its derivative is zero:

  p' = (1/4)(3x^2 -4nx +n^2) = 0

  (3x -n)(x -n) = 0 . . . . . . . . . . . . . factor

  x = n/3  or  n

We know that x=n will give a minimum product (0), so the maximum product is obtained when x = n/3.

<h3>more parts</h3>

A similar development can prove by induction that the parts must all be equal.

6 0
3 years ago
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Answer:

12 months because $50 for 12 months is $600

Step-by-step explanation:

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DedPeter [7]

Answer:

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Step-by-step explanation:

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3 years ago
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