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Sidana [21]
3 years ago
11

Can someone help? This is really hard for me

Mathematics
2 answers:
lisov135 [29]3 years ago
5 0

Answer: C. 22/5 + 9i/5

Step-by-step explanation:

8-7i/1-2i divided by 1+2i/1+2i

combine: (8-7i)(1+2i)/1-2i)(1+2i)

simplify the numerator

Use foil method

8 times 1+8(2i)-7i times 1 -7i(2i) divided by (1-2i)(1+2i)

Combine like terms

22+9i divided by (1-2i)(1+2i)

simplify denominator

22+9i/5

Split fraction into two fractions

22/5 +9i/5

kkurt [141]3 years ago
4 0

Answer:

=  \frac{22}{5}  +  \frac{9i}{5}

Step-by-step explanation:

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erastovalidia [21]

All you need is the double angle identity:

\cos^2x=\dfrac{1+\cos2x}2

So we have

\cos^4x=(\cos^2x)^2=\left(\dfrac{1+\cos2x}2\right)^2=\dfrac{1+2\cos2x+\cos^22x}4

Apply the identity again to the squared term:

\cos^4x=\dfrac{1+2\cos2x+\frac{1+\cos4x}2}4=\dfrac{3+4\cos2x+\cos4x}8

6 0
3 years ago
Hello the question is in the picture ( only C)
pav-90 [236]

SOLUTION:

A normal distribution would model this situation because the distribution is approximately symmetrical, thus the mean, median and mode are approximately the same and the population size is large ( greater than 30).

6 0
1 year ago
answer at the state fair there are 36 children standing in line waiting to ride the roller coaster there are 10 cars on the roll
stira [4]
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3 0
3 years ago
What do I put as the answer ?
ElenaW [278]

Answer:

33

Step-by-step explanation:

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3 years ago
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