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Mrrafil [7]
3 years ago
9

PLEASE HELP

Mathematics
1 answer:
cricket20 [7]3 years ago
4 0
You can use the cosine rule for this - you might have to change some of the letters around for it to make sense though. Hope this helps!

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Determine whether each question is biased. Explain your answer. please help!!
LenKa [72]
I’m having a hard time understanding your question
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3 years ago
Three numbers are in an arithmetic progression with a common difference of 6. if 4 is subtracted from the first number, 1 is sub
UkoKoshka [18]

Answer:

  either of {-9.5, -3.5, 2.5} or {7, 13, 19}

Step-by-step explanation:

Let x represent the first number of the arithmetic sequence. Then the second number is x+6, and the third number is x+12. The geometric sequence is then ...

  (x -4), (x +5), 3(x+9)

The common ratio is then ...

  (x +5)/(x -4) = 3(x +9)/(x +5)

Cross-multiplying gives ...

  (x +5)² = 3(x -4)(x +9)

  x² +10x +25 = 3x² +15x -108 . . . . eliminate parentheses

  0 = 2x² +5x -133 . . . . . . . . . . . . . . subtract the left side

  0 = (2x +19)(x -7) . . . . . . . . . . . . . . factor

  x = -9.5 . . or . . 7

The possible original three numbers are ...

  {-9.5, -3.5, 2.5} . .  or . . {7, 13, 19}

8 0
3 years ago
What is the number of solutions of 4x^2+12x+9=0?
Gwar [14]

Answer:

One Real number solution

Step-by-step explanation:

check the discriminant

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...

144 - 16*9 =  0

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7 0
3 years ago
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Paul [167]
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We'll do the sine trig. identity, as it is the most effective.

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So, for this setup:
sin(20)= \frac{x}{10}

Now, we solve for x:
x=10sin(20)=3.42

So, answer is 3.4
7 0
3 years ago
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An electrician charges an hourly rate of $75, but also charges a fixed fee for making house calls regardless of time spend on th
Trava [24]
The answer is going to be C(t)= 150

5 0
3 years ago
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