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Rasek [7]
4 years ago
9

Adding and subtracting complex numbers question

Mathematics
1 answer:
Darina [25.2K]4 years ago
8 0
True because i² = -1 and a and b are real
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A girl that is 4 feet tall is standing next to the empire State building in New York city. The girls shadow is 3.2 feet long. If
lesya692 [45]

Answer: 1163.2 feet

<u>Step-by-step explanation:</u>

Set up the proportion then cross multiply:

\frac{height(girl)}{height(building)} = \frac{shadow (girl)}{shadow(building)}

\frac{4}{1454} = \frac{shadow (3.2)}{x}

4(x) = 1454(3.2)

   x = \frac{1454(3.2)}{4}

   x = 1163.2

3 0
3 years ago
One positive integer is 1 less than another the product of two integers is 72 what are the integers
Fynjy0 [20]
The positive integers would be 8 and 9

because 8*9= 72
3 0
3 years ago
Read 2 more answers
Researchers want to investigate if students retain more information if it printed on blue paper rather than white paper. They re
Debora [2.8K]

Answer:

Stratified design with color of paper as the blocks

Step-by-step explanation:

The experimental design that this question uses is the stratified design with color of paper as the blocks

A stratified design is one where the population has been divided into strata that are homogeneous. A good number of participants would then be picked for each of the stratum. The homogeneous strata are also known as the blocks and here in this question we have color of paper as the block here.

The students are of different school levels, elementary, high school and middle school. Each of these levels have 100 students. The students in each levels are halved and each half is randomly assigned information on either a white paper or a blue paper.

5 0
3 years ago
I've been working on this for 2+ hours, so frustrated, my last tutor got it wrong too.
disa [49]

Answer:

20

Step-by-step explanation:

sin(28)       sin(x)

---------- =  -----------

   7               5

sin(28)* 5 = 7sin(x)

---------------------------

             7

sin(28) * 5

---------------- = sin(x)

       7

You have to seperate sin from (x). When you do that, it becomes inverse (sin^-1).

              sin(28) * 5

 sin^-1 (------------------)  = x

                    7

Imput that into you calculator, and you should get 19.59302173 (20 to the nearest degree)

Hope this helps.

6 0
3 years ago
Can someone help me with this I dont understand. Thank you so much!
Svet_ta [14]

Answer:

11000998

Step-by-step explanation:

the angle was joining

because we have subtract number

8 0
3 years ago
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