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gladu [14]
3 years ago
7

For i = \-1, what is the sum (7+3i) + (-8+9i) ?

Mathematics
1 answer:
Alex777 [14]3 years ago
3 0

add the real parts together and then the imaginary parts together

7 + -8 = -1

3 + 9 = 12

-1 + 12 i

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When rabbits were introduced to the continent of Australia they quickly multiplied and spread across the continent since there w
Lady bird [3.3K]

Answer:

a. y=6(1.7472)^x

b. y=6e^{0.558t}

c.13.3 months

Step-by-step explanation:

a.-Given the first term  at t_0 is 6 and the second term at t_3 is 32.

-Let's take rabbit population as a function of time to be

y=ab^x

where y is the population at time x and a the initial population at t_0\\

#We substitute our values to calculate the value of the constant b:

y_x=ab^x\\\\y_3=ab^3\\\\32=6b^3\\\\b=1.472

#Replace b in the population function:

y=ab^x, b=1.7472,a=6\\\\\therefore y=6(1.7472)^x

Hence, the regression for the rabbit population as a function of time x is y=6(1.7472)^x

b. The exponential function in terms of base e is usually expressed as:

A=A_0e^{kt}

Where:

A_0-is the initial population at t_o

A-is the population at time t.

k-is the  exponential growth constant.

e- the exponent

Our function in terms of base exponent is rewritten as:

y=A_0e^{kt}

#Substitute with actual figures to solve for t:

y=A_0e^{kt}, y=32, xt=3, A_0=6\\\\32=6e^{3k}\\\\3k=In (32/6)\\\\k=0.5580

Hence, the regression equation in terms of base e is y=6e^{0.558t}

c. We substitute y with any number higher than 10,000 to estimate the time for the rabbits to exceed 10,000.

-We know that y=6e^{0.558t}.

Therefore we calculate t as(take y=10001):

y=6e^{0.558t}, y=10001\\\\10001=6e^{0.558t}\\\\1666.8333=e^{0.558t}\\\\0.558t= In 1666.8333\\\\t=13.2951

Hence, it takes approximately 13.3 months for the population to exceed 10000

3 0
4 years ago
Alvin's age is two times Elga's age. The sum of their ages is 24. What is Elga's age?
gulaghasi [49]
Alvin is 16 and Elga is 8.

16 is two times bigger than 8 and 16+8= 24
8 0
2 years ago
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Write the equation in slope-intercept form.<br> 5x + 3y = 11
pshichka [43]

Answer:

y = -5/3 x + 11/3

Step-by-step explanation:

5x +3y = 11

3y = 11 - 5x

y = -5/3 x + 11/3

8 0
3 years ago
In a school election, 3/4 of the students vote. there are 1464 votes. find the number of students.
dalvyx [7]

Answer:

1952

Step-by-step explanation:

1464/3/4 = 1952

8 0
3 years ago
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Boats from all along the Atlantic coast dock at a busy marina. Of the first boats to dock there one day, 10 of the boats were fr
trasher [3.6K]

Answer:

6 boats

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So, lets make ratio with is 1/1 because for every 1 boat from other states, there is 1 boat for South Carolina.

There are 12 boats, divide them evenly to get the answer of 6 boats from South Carolina. The reason for dividing by two was due to the fact that half for South Carolina and half from other states. Now there is your answer.

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3 years ago
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