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Vlada [557]
4 years ago
9

At a fundraiser, students sold chocolate bars with almonds and chocolate bars with walnuts. The number of chocolate bars with al

monds that were sold one weekend was 3 less than 2 times the number of chocolate bars with walnuts that were sold. The number of chocolate bars with walnuts plus 4 times the number of chocolate bars with almonds was 300. How many of each kind of chocolate bar were sold that weekend?
Mathematics
1 answer:
BabaBlast [244]4 years ago
6 0

Answer:

Total number chocolate bars with almonds sold were approximately 66.34 and total number chocolate bars with walnuts sold were approximately 34.67.

Step-by-step explanation:

Let number chocolate bars with almonds be x

Also let number chocolate bars with walnuts be y

Given:

Number of chocolate bars with almonds that were sold one weekend was 3 less than 2 times the number of chocolate bars with walnuts.

Framing the above sentence in equation form we get;

x=2y -3

Also given:

The number of chocolate bars with walnuts plus 4 times the number of chocolate bars with almonds was 300.

Framing the above sentence in equation form we get;

4x+y=300

Now Substituting the value of x in above equation we get;

4x+y=300\\4(2y-3)+y=300\\8y-12+y=300\\9y=300+12\\9y=312\\\\y=\frac{312}{9} \approx 34.67

Now we will substitute the value of y in equation x=2y -3 we get;

x=2y-3 = 2\times34.67 -3 = 69.34-3\approx66.34

Hence, Total number chocolate bars with almonds sold were approximately 66.34 and total number chocolate bars with walnuts sold were approximately 34.67.

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Dentify on which quadratic function is positive.
Olin [163]

Answer:

\textsf{$y = 2x^2 - 17x + 30$: \quad $\left(-\infty, \dfrac{5}{2}\right) \cup (6, \infty)$}

\textsf{$y = - x^2 - 6x - 8$: \quad $\left(-\infty, -4\right) \cup (-2, \infty)$}

Step-by-step explanation:

A function is positive when it is <u>above the x-axis</u>, and negative when it is <u>below the x-axis</u>.

---------------------------------------------------------------------------------

<u>Given quadratic equation</u>:

y = 2x^2 - 17x + 30

Factor the equation:

\implies y = 2x^2 - 17x + 30

\implies y = 2x^2 - 5x-12x + 30

\implies y=x(2x-5)-6(2x-5)

\implies y=(x-6)(2x-5)

The x-intercepts of the parabola are when y = 0.

To find the <u>x-intercepts</u>, set each factor equal to zero and solve for x:

\implies x-6=0 \implies x=6

\implies 2x-5=0 \implies x=\dfrac{5}{2}

Therefore, the x-intercepts are x = ⁵/₂ and x = 6.

The leading coefficient of the given function is positive, so the <u>parabola opens upwards</u>.  

The function is positive when it is <u>above the x-axis</u>.

Therefore, the function is positive for the values of x less than the smallest x-intercept and more than the largest x-intercept:

  • \textsf{Solution: \quad $x < \dfrac{5}{2}$ \;and \;$x > 6$}
  • \textsf{Interval notation: \quad $\left(-\infty, \dfrac{5}{2}\right) \cup (6, \infty)$}

---------------------------------------------------------------------------------

<u>Given quadratic equation</u>:

y = - x^2 - 6x - 8

Factor the equation:

\implies y = - x^2 - 6x - 8

\implies y = -(x^2 +6x +8)

\implies y = -(x^2 +4x +2x+8)

\implies y = -((x(x+4)+2(x+4))

\implies y = -(x+4)(x+2)

The x-intercepts of the parabola are when y = 0.

To find the <u>x-intercepts</u>, set each factor equal to zero and solve for x:

\implies x+4=0 \implies x=-4

\implies x+2=0 \implies x=-2

Therefore, the x-intercepts are x = -4 and x = -2.

The leading coefficient of the given function is negative, so the <u>parabola opens downwards</u>.  

The function is negative when it is <u>below the x-axis</u>.

Therefore, the function is negative for the values of x less than the smallest x-intercept and more than the largest x-intercept:

  • \textsf{Solution: \quad $x < -4$ \;and \;$x > -2$}
  • \textsf{Interval notation: \quad $\left(-\infty, -4\right) \cup (-2, \infty)$}

4 0
1 year ago
Read 2 more answers
A store plans to sell two different game consoles, the YuuMi and the ZBox. The store’s wholesale cost for a YuuMi is $250, and t
strojnjashka [21]

9514 1404 393

Answer:

  • Constraints: x + y ≤ 250; 250x +400y ≤ 70000; x ≥ 0; y ≥ 0
  • Objective formula: p = 45x +50y
  • 200 YuuMi and 50 ZBox should be stocked
  • maximum profit is $11,500

Step-by-step explanation:

Let x and y represent the numbers of YuuMi and ZBox consoles, respectively. The inventory cost must be at most 70,000, so that constraint is ...

  250x +400y ≤ 70000

The number sold will be at most 250 units, so that constraint is ...

  x + y ≤ 250

Additionally, we require x ≥ 0 and y ≥ 0.

__

A profit of 295-250 = 45 is made on each YuuMi, and a profit of 450-400 = 50 is made on each ZBox. So, if we want to maximize profit, our objective function is ...

  profit = 45x +50y

__

A graph is shown in the attachment. The vertex of the feasible region that maximizes profit is (x, y) = (200, 50).

200 YuuMi and 50 ZBox consoles should be stocked to maximize profit. The maximum monthly profit is $11,500.

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3 years ago
ali drove 268 miles using12 gallons of gas at this rate how many miles would he drive using 9 gallons of gas
Semenov [28]

Divide total miles driven by the total amount of gas used to find the number of miles per gallon.

Then multiply that by the number of gallons you want to find out:


268 miles / 12 gallons = 22.333 miles per gallon.

22.333 miles per gallon x 9 gallons = 201 total miles.

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3 years ago
Julie spend 5.62 dollars at the store. Micah spends 5 times as much as Julie. Jermy spends 6.72 more than micah. How much money
Arturiano [62]
Julie : 5.62

Micah : 5.62 x 5 = 28.1

Jermy : 5.62 + 6.72 = 12.34
7 0
4 years ago
Read 2 more answers
Using the formula in model 1, choose the correct answers for the new balance and amount of interest earned in the following comp
melisa1 [442]
To find the total amount
The formula is
A=p (1+r)^t
A total amount?
P present value 1050
R interest rate 0.06
T time 25 years
A=1,050×(1+0.06)^(25)=4,506.46

Interest amount
I=A-p
I=4,506.46−1,050
I=3,456.46
5 0
4 years ago
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