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sattari [20]
3 years ago
11

What is the square root of -1? Why is it necessary to define i?

Mathematics
2 answers:
sweet [91]3 years ago
8 0

Answer:

1

Step-by-step explanation:

Square roots are always the oposite

Troyanec [42]3 years ago
4 0

The square root of negative -1 is positive 1.

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Evaluate |6(-7)-4| - |-4|·|7| + 8(3)
Margaret [11]

|6( - 7) - 4|  -  | - 4|  \times  |7|  + 8(3)
|168|  -  | - 4|  \times  |7|  + 24
168 - 4 \times 7 + 24
PEMDAS
168  - 28 + 24
168 - 52
116
5 0
2 years ago
Read 2 more answers
For a function f(x), a) if f(7) = 22 then f^-1(22) = b) f^-1(f(c)) =
Marina86 [1]

Answer:  a) 7

               b) c

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

Inverse is when the x's and y's are swapped.

a)

f(7) = 22 means ..... when x = 7, then y = 22

The inverse is ..... when x = 22, then y = 7

b)

f⁻¹(f(c)) means ...... when x = f(c), then y = c

The reverse of the inverse is ..... when x = c, then y = f(c)

3 0
3 years ago
Read 2 more answers
:))))))))))))))))))))))))))))
bixtya [17]

Answer:

12 inches

Step-by-step explanation:

Set up an equation:

Variable x = height of the scale model

3/18 = x/72

Cross multiply:

3 × 72 = 18 × x

216 = 18x

Divide both sides by 18:

12

4 0
3 years ago
At a college, 72% of courses have final exams and 46% of courses require research papers. Suppose that 32% of courses have a res
Ghella [55]

Answer:

a) P(F UR) = P(F) +P(R) -P(F and R) = 0.72+0.46-0.32=0.86

b) P(FUR)' = 1-P(FUR)= 1-0.86 = 0.14

Step-by-step explanation:

Let's define the following events first:

F: The event that a course has a final exam.

R: The event that a course requires a research paper

From the info provided we have that:

P(F) = 0.72, P(R) =0.46 P(F and R) =0.32

So then we can create a Venn diagram as we can see on the figure attached.

a. Find the probability that a course has a final exam or a research project.

For this case we can find the probability like this:

P(F UR) = P(F) +P(R) -P(F and R) = 0.72+0.46-0.32=0.86

b. Find the probability that a course has NEITHER of these two requirements.

For this case we can use the complement rule and we can find the probability like this:

P(FUR)' = 1-P(FUR)= 1-0.86 = 0.14

And that's the same value obtained with the diagram.

8 0
3 years ago
A football player ran for a 9 yard touchdown. How many feet is this?
Zina [86]

Answer:

The conversion from yards to feet is 3 to 1.

Using this scenario, the football player ran 27 feet to the end zone for a touchdown.

Hopefully this helps! Feel free to mark brainliest!

4 0
3 years ago
Read 2 more answers
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