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3 years ago

What is the sum of (2+4i) and (7+11i)

Mathematics

2 answers:

Romashka [77]3 years ago

3 0

Add like terms
2+4i +7 +11 i =
2+7 + 4i+11i =
9+15i

Ksivusya [100]3 years ago

3 0

To find the sum on (2 + 4i) and (7 + 11i) we need to add like terms

The phrase, “like terms” refers to numbers with the same variables

To combine 2 + 4i and 7 + 11i

We need to add the constants, (2 and 7), and the variables (4i and 11i) together and then add a plus sign between the two sums to get our answer

2 + 7 = 9

4i + 11i = 15i

At this point, it is not possible to combine 9 and 15i any further, because they are not like terms, instead we just add a plus sign between the two

15i + 9

SHORT EXPLAINATION:

To solve, add the numbers without the “i” together, then add the numbers with the “i” together, take the two sums and put a plus sign between them

2 + 7 = 9
4 + 11 = 15

Answer: 15i + 9

I hope this helps! <3

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3 years ago

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Answer:

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Step-by-step explanation:

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2 years ago

X + 78 = 90 can someone solve this for me please?

kondaur [170]

Let's solve your equation step-by-step.

x+78=90

Step 1: Subtract 78 from both sides.

x+78−78=90−78

x=12

Please put brainliest!

8 0

3 years ago

Somebody please help me with my homework it do tomorrow!!!

xxTIMURxx [149]

The solution to given system of equations is (x, y) = (2, -1)

Solution:

Given system of equations are:

-1x + 2y = -4 -------- eqn 1

4x + 3y = 5 ------- eqn 2

We can solve the above system of equations by elimination method

Multiply eqn 1 by 4

4(-1x + 2y = -4)

-4x + 8y = -16 ------ eqn 3

Add eqn 2 and eqn 3

4x + 3y = 5

-4x + 8y = -16

( + ) --------------------

0x + 11y = -16 + 5

11y = -11

y = -1

Substitute y = -1 in eqn 1

-1x + 2(-1) = -4

-x -2 = -4

-x = -4 + 2

-x = -2

x = 2

Check the answer:

Substitute x = 2 and y = -1 in eqn 2

4x + 3y = 5

4(2) + 3(-1) = 5

8 - 3 = 5

5 = 5

Thus the obtained answer is correct

Thus the solution to given system of equations is (x, y) = (2, -1)

8 0

3 years ago

The ratio of jumps to falls for ice skater Rhonda is 4 falls to every 15 jumps. At this rate, how many times will she not fall i

Inessa05 [86]

Answer:

Rhonda will not fall 264 times in 360 jumps.

Solution:

Given, The ratio of jumps to falls for ice skater Rhonda is 4 falls to every 15 jumps.

We have to find At this rate, how many times will she not fall in 360 jumps.

Now,

For 15 jumps → 4 falls

For 360 jumps → n falls

Now apply Chris cross method,

$15 \times n=360 \times 4 \rightarrow n=\frac{360 \times 4}{15}=24 \times 4=96$

So, she falls 96 times in 360 jumps.

Then, number of times she will not fall = 360 jumps – 96 falls = 264 times.

Hence, Rhonda will not fall 264 times in 360 jumps.

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3 years ago