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mote1985 [20]
2 years ago
14

How to solve this? Is the question correct? ty :)

Mathematics
1 answer:
bezimeni [28]2 years ago
4 0

Answer:

The proposition is true.

Step-by-step explanation:

Now we proceed to demostrate that expression given is true by algebraic means:

1) \frac{x^{-1}+y^{-1}}{x^{-1}}+\frac{x^{-1}-y^{-1} }{y^{-1}} Given

2) \frac{y^{-1}\cdot (x^{-1}+y^{-1})+x^{-1}\cdot (x^{-1}-y^{-1})}{x^{-1}\cdot y^{-1}}   \frac{a}{b} + \frac{c}{d} = \frac{a\cdot d+b\cdot c}{b\cdot d}

3) \frac{x^{-1}\cdot y^{-1}+y^{-2}+x^{-2}-x^{-1}\cdot y^{-1}}{x^{-1}\cdot y^{-1}} Distributive property/a^{b}\cdot a^{c} = a^{b+c}

4) \frac{x^{-2}+y^{-2}}{(x\cdot y)^{-1}} Commutative, associative and modulative properties/Existence of additive inverse/a^{b}\cdot c^{b} = (a\cdot c)^{b}

5) [(x\cdot y)^{-1}]^{-1}\cdot (x^{-2}+y^{-2}) Commutative property/Definition of division

6) (x\cdot y)\cdot (x^{-2}+y^{-2})         (x^{-1})^{-1}

7) x^{-1}\cdot y + x\cdot y^{-1} Distributive property/Associative property/a^{b}\cdot a^{c} = a^{b+c}

8) (x^{-1}\cdot y^{-1})\cdot y^{2} + (x^{-1}\cdot y^{-1})\cdot x^{2}  Modulative property/Existence of additive inverse/a^{b}\cdot a^{c} = a^{b+c}

9) (x^{-1}\cdot y^{-1})\cdot (x^{2}+y^{2}) Distributive property

10) (x\cdot y)^{-1}\cdot (x^{2}+y^{2}) a^{b}\cdot c^{b} = (a\cdot c)^{b}

11) \frac{x^{2}+y^{2}}{x\cdot y} Commutative property/Definition of division/Result

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I need help please it’s due tomorrow.......
Sholpan [36]
Let
x-------> the width of the rectangular area
y------> the length of the rectangular area

we know that
y=x+15------> equation 1
perimeter of a rectangle=2*[x+y]
2x+2y <= 150-------> equation 2

substitute 1 in 2
2x+2*[x+15] <=150--------> 2x+2x+30 <=150----> 4x <=150-30
4x <= 120---------> x <= 30
the width of the rectangular area is at most 30 ft
y=x+15
for x=30
y=30+15------> y=45
 the length of the rectangular area is at most 45 ft

see the attached figure
the solution is<span> the shaded area</span>

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3 years ago
What additional information could be used to prove that △ABC ~ △NML? Check all that apply. ∠B ≅ ∠M △ABC is a right triangle. △AB
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Answer:

1,3,5

Step-by-step explanation:

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3 years ago
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bekas [8.4K]

Answer:How many miles can a car be driven in 3 hours at 50 miles per hour? Under normal circumstances and the generally assumed conditions, the answer is of course (3 hours) * (50 miles / hour) = 150 miles.

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Step-by-step explanation:So you drive 25 miles / hour. then 25 miles/ 1 hour = 225 miles / nb of hours.2 minutes

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Answer:

\text{D. }b^2-4ac>0

Step-by-step explanation:

The equation b^2-4ac represents the discriminant of a quadratic. It is the part taken from under the radical in the quadratic formula.

For any quadratic:

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In the graph, we see that the equation intersects the x-axis at two distinct points. Therefore, the quadratic has two solutions and the discriminant must be positive. Thus, we have b^2-4ac>0.

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