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Zinaida [17]
3 years ago
10

Pls helppppp!!

Mathematics
1 answer:
Wittaler [7]3 years ago
8 0
1) -5-4i
2) 5+4i
3) -4+5i
hope this helps pls mark me branliest!!<3
You might be interested in
A piece of work can be completed by 45 men in 90 days if only 30 men are available, how many days will it take to complete the s
andrew-mc [135]

Answer:

  135 days

Step-by-step explanation:

Often, we measure work in man·days. This piece of work requires ...

  (45 man)·(90 days) = 4050 man·days

When there are only 30 men, the number of days required can be found by dividing this work by the number of men:

  4050 man·days/(30 man) = 135 days

_____

Another approach is to realize the time is inversely proportional to the number of men. If the number of men is 30/45 = 2/3 the original, then the time will be 3/2 the original, or ...

  (3/2)·90 days = 135 days.

7 0
3 years ago
Read 2 more answers
Two of the steps in the derivation of the quadratic formula are shown below. Step 6: = Step 7: = x + Which operation is performe
OLEGan [10]

Answer:C: taking the square root of both sides of the equation

this answer was given to you by shanel :))))

<em><u>HAVE A GREAT DAY YOU LOOK GREAT TODAY ;)</u></em>

:):):):):):):):):):):):):):):):):):):):):)

7 0
3 years ago
Read 2 more answers
Please help, i need to raise my grade <br>solve for v​
zhenek [66]

Answer:

2(s-c)/ a^2 =  v

Step-by-step explanation:

s = 1/2 a^2 v+c

Subtract c from each side

s -c = 1/2 a^2 v+c-c

s-c = 1/2 a^2 v

Multiply each side by 2

2(s-c) = 2* 1/2 a^2 v

2(s-c) = a^2 v

Divide each side by a^2

2(s-c)/ a^2 = a^2 v /a^2

2(s-c)/ a^2 =  v

8 0
3 years ago
A Cepheid variable star is a star whose brightness alternately increases and decreases. For a certain star, the interval between
victus00 [196]

Answer:

a) \frac{dB}{dt} = \frac{5\pi}{4.2} \cdot \cos \left(2\pi\cdot \frac{t}{4.2} \right), b) \frac{dB}{dt}\approx 5.595

Step-by-step explanation:

a) The rate of change of the brightness of the Cepheid can be determined by deriving the function in time:

\frac{dB}{dt} = \left(\frac{2\pi}{4.2} \right)\cdot 0.25\cdot \cos (2\pi\cdot \frac{t}{4.2})

\frac{dB}{dt} = \frac{5\pi}{4.2} \cdot \cos \left(2\pi\cdot \frac{t}{4.2} \right)

b) The rate of increase after one day is:

\frac{dB}{dt} = \frac{5\pi}{4.2} \cdot \left(2\pi \cdot \frac{1}{4.2} \right)

\frac{dB}{dt}\approx 5.595

4 0
3 years ago
Determine the measures of angles C and D.<br>​
Morgarella [4.7K]

Answer:

c = 40 and d = 76

Step-by-step explanation:

this is going to take me a long time to explain but here we go

so you need to do 180 - 116 and get 64.

then create a equation that is like this 7y + 6 + 4y + 64 = 180

when you solve it you get y = 10

then plug in 10 in for y in 4y. and you get 40 for c

do the same for d and you will get 76

pls mark me brainleist because i didnt waster your time.

7 0
2 years ago
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