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Illusion [34]
3 years ago
7

steve has these score on the exams for this semester 89 92 and 87. How much will have to make on the fourth exam to have a final

average of an A( 92% or better)

Mathematics
1 answer:
Zinaida [17]3 years ago
6 0
THIS IS THE CORRECT ANSWER I GOT WHEN SOLVING ON MY IPHONE

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Solve 4 cos2x-3 = 0 for all real values of x.
vichka [17]

4 cos² x - 3 = 0

4 cos² x = 3

cos² x = 3/4

cos x = ±(√3)/2

Fixing the squared cosine doesn't discriminate among quadrants.  There's one in every quadrant

cos x = ± cos(π/6)

Let's do plus first.  In general, cos x = cos a has solutions x = ±a + 2πk integer k

cos x = cos(π/6)

x = ±π/6 + 2πk

Minus next.

cos x = -cos(π/6)

cos x = cos(π - π/6)

cos x = cos(5π/6)

x = ±5π/6 + 2πk

We'll write all our solutions as

x = { -5π/6, -π/6, π/6, 5π/6 } + 2πk integer k

3 0
3 years ago
If DF = 170, find the value of x. Then find DE and EF.<br> DE=3x + 20<br> EF=2x + 40
Julli [10]

9514 1404 393

Answer:

  DE = 86

  EF = 84

Step-by-step explanation:

We assume that point E lies on segment DF, so that ...

  DE + EF = DF

  (3x +20) +(2x +40) = 170

  5x = 110 . . . . . . . . . . . . . . . collect terms, subtract 60

  x = 22 . . . . . . . . . . . . divide by 5

  DE = 3×22 +20 = 66 +20 = 86

  EF = 2×22 +40 = 44 +40 = 84

7 0
3 years ago
Please help me.
Paul [167]

Answer:

(1,K) hope i could help

Step-by-step explanation:

3 0
3 years ago
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Select the correct answer from the each drop-down menu. if 0
diamong [38]

Answer:

You didn't provide a image of the problem how am I suppose to help you

8 0
2 years ago
PLS HELP ME OB THIS QUESTION I WILL MARK YOU AS BRAINLIEST IF YOU KNOW THE ANSWER!!
Zolol [24]

Answer:

D. Positively skewed

Step-by-step explanation:

6 0
3 years ago
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