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lidiya [134]
3 years ago
8

Help pls I really need it

Mathematics
1 answer:
Talja [164]3 years ago
8 0

Answer:

Infinite number of solutions

Step-by-step explanation:

when you solve for V, you notice that the term in "v" goes away, and you end up with a true statement:

2 = 2

This is a true statement no matter what values the variable V has, so it is true for all possible (infinite) values of "v".

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yanalaym [24]

Substitute n = 4

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3 years ago
Find all values of $x$ such that $\dfrac{x}{x+4} = -\dfrac{9}{x+3}$. If you find more than one value, then list your solutions i
mixer [17]

We start with

\dfrac{x}{x+4} = -\dfrac{9}{x+3}

Assuming that x \notin \{-4,\ -3\} we can cross multiply the equation:

x(x+3) = -9(x+4) \iff x^2+3x=-9x-36 \iff x^2+12x+36=0

You can recognize the perfect square pattern in the quadratic equation:

x^2+12x+36 = (x)^2 + 2\cdot x \cdot 6 + (6)^2 = (x+6)^2

So, we have

x^2+12x+36=0 \iff (x+6)^2 = 0 \iff x+6=0 \iff x=-6

Which is the only solution, with multiplicity 2.

8 0
4 years ago
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The resultant of a 15 pound force and an 8-pound force acting on an object is 10 pounds.
natali 33 [55]

Answer:

112 degrees.

Step-by-step explanation:

  • as we know that the three set of forces will form a triangle, by using cosine rule, we can find the required angle.
  • follow the diagram in the attachment.
  • by cosine rule for \alpha,

2*10*8*cos \alpha= 8^{2} +10^{2} -15^{2}  = 64+100-225= 164-225=-61

now, dividing both sides by 2*10*8,

cos \alpha = -61/160

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