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butalik [34]
3 years ago
7

Simplify 2/5+2/5-7/15​

Mathematics
2 answers:
almond37 [142]3 years ago
6 0

Answer:

1/3

Step-by-step explanation:

2/5+2/5-7/15

=2+2/5 -7/15

=4/5-7/15

=4×3-7/15

=12-7/15

=5/15

=1/3 Ans.

elixir [45]3 years ago
5 0

Answer:

\frac{1}{3}

Step-by-step explanation:

\frac{2}{5} +\frac{2}{5} -\frac{7}{15}

=\frac{4}{5} -\frac{7}{15}

=\frac{(4)(15)-(5)(7)}{(5)(15)}=\frac{60-35}{75} =\frac{25}{75}

Simplified:

=\frac{1}{3}

Hope this helps

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Graph a parabola whose x-intercepts are at x=-3 and x=5 and whose minimum value is y=-4
docker41 [41]

Answer:

(See explanation for further details)

Step-by-step explanation:

The standard equation of the parabola is:

y + 4 = C \cdot (x-k)^{2}

The formula is now expanded into a the form of a second-order polynomial:

y + 4 = C\cdot x^{2} -2\cdot C\cdot k \cdot x +C\cdot k^{2}

y = C\cdot x^{2} - (2\cdot C \cdot k) \cdot x + (C\cdot k^{2}-4)

The general equation of the second-order polynomial is:

x = \frac{2\cdot C \cdot k \pm \sqrt{4\cdot C^{2}\cdot k^{2}-4\cdot C\cdot (C\cdot k^{2}-4)}}{2\cdot C}

x = k \pm \frac{\sqrt{C^{2}\cdot k^{2}-C^{2}\cdot k^{2}+4\cdot C}}{C}

x = k \pm 2\cdot \frac{\sqrt{C}}{C}

x = k \pm \frac{2}{\sqrt{C}}

The equations to be solved are presented herein:

-3 = k -\frac{2}{\sqrt{C}}

5 = k + \frac{2}{\sqrt{C}}

Now, the solution of the system is:

-3 +\frac{2}{\sqrt{C}} = 5 -\frac{2}{\sqrt{C}}

\frac{4}{\sqrt{C}} = 8

\sqrt{C} = \frac{1}{2}

C = \frac{1}{4}

k = 5 - \frac{2}{\sqrt{\frac{1}{4} }}

k = 1

The equation of the parabola is:

y = \frac{1}{4}\cdot (x-1)^{2} -4

Lastly, the graphic of the function is included as attachment.

3 0
3 years ago
An industry demand curve faced by firms in a duopoly is P = 69 - Q, where Q = Q1 + Q2. MC for each firm is 0. How many units sho
emmasim [6.3K]

You first need to establish the benefits function B. For each firm it is equal to the amount produced (q1 for firm 1 and q2 for firm 2) multiplied by the price P, minus cost C. It is

B1 = P.q1 - C1 = (69 - q1 - q2)q1 - C1

B2= P.q2 - C2 = (69 - q1 - q2)q2 - C2

As firma Will maximize benefits we need the derivative in q1 and q2 for firms 1 and 2 respectively. This will give us

69 - 2q1 - q2 = 0

69 - q1 - 2q2 = 0

Note that the derivative of cost is null as marginal cost is null.

Thus,

q2= 69 - 2q1

Replacing on the second equation:

69- q1 - 138 + 4q1 = 0

-69 + 3q1= 0

q1= 69/3=23

Replacing in the q2 equation:

q2=69- 46= 23

To find the money they make replace in benefits function. First we find piece P=69-23-23=23. Thus:

B1=23*23-C1

B2=23*23-C2

As we don't have a value for C1 and C2 we can't compute a number for benefits. If you have these values you will have the benefits.

7 0
4 years ago
Please help i need answer asap
ycow [4]

Answer:

1: x=-3

2: x=1 is the answer

5 0
3 years ago
Please answer ASAP!! Consistently wash your hands for 1 minute.
diamong [38]

Each peach costs $0.56 and the equations used to solve that is 4x= 2.24 where x is the cost of 1 peach.

Step-by-step explanation:

Step 1:

It is given that all the peaches weigh the same and that 4 peaches weigh 1 pound.

Assume that each peach costs x.

So the cost for 4 peaches is given by 4x.

Step 2:

The cost of 1 pound of peaches is given as $2.24.

1 pound of peaches=4x.

So 4x= 2.24, x = \frac{2.24}{4}.

x = 0.56.

So each peach costs $0.56.

5 0
3 years ago
What is 14% of $59.99 and how do I figure this problem?
serious [3.7K]
Is/of =%/100 so x/59.99=14%/100 Cross multiply to get the answe
4 0
3 years ago
Read 2 more answers
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