3 years ago

Can someone solve this with an explanation?

Mathematics

1 answer:

Readme [11.4K]3 years ago

5 0

The correct answer is C

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-64=(2cos(pi/2)+2i sin(pi/2))^n..... n=??

zvonat [6]

Answer:

The real solution is $n=6$ .

Step-by-step explanation:

$\cos(\frac{\pi}{2})=0$ while $\sin(\frac{\pi}{2})=1$

So the equation becomes:

$-64=(2(0)+2i(1))^n$

$-64=(0+2i)^n$

$-64=(2i)^n$

We know that $2^6=64$ . So let's see what $n=6$ gives us:

$(2i)^6=64i^6=64i^4i^2=64(1)(-1)=-64$ .

$-64$ is the result we wanted.

$n=6$ is therefore a solution.

4 0

3 years ago

Help me with this problem

omeli [17]

Add -3.4 to both sides
-9.3 = y
Hope this helps!

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3 years ago

Solve this polynomial:

nadezda [96]

Answer:

4ab +10b

Step-by-step explanation:

Perhaps you want to simplify the expression.

$(2.5ab+14b)-(-1.5ab+4b)=2.5ab+14b+1.5ab-4b\\\\=ab(2.5+1.5)+b(14-4)=\boxed{4ab+10b}$

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3 years ago

How many multiples of 10 are there from 100 to 200?

kicyunya [14]

Answer:

100,110,120,130,140,150,160,170,180,190,200

Step-by-step explanation:

count in 10s

5 0

3 years ago

Read 2 more answers

There are 150 students in the band and 90 students in the chorus. One half of the band members and 4/5 of the chorus members par

Anit [1.1K]

150 x 1/2 = 75
90 x 4/5 = 72

3 members

4 0

3 years ago