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crimeas [40]
3 years ago
9

I need to answer this math question and I have no idea what it’s talking about

Mathematics
1 answer:
marishachu [46]3 years ago
8 0

The top right box is correct.

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Can some one help me on this and thank u
atroni [7]

Answer:

2<x<3

Step-by-step explanation:

the first one

5 0
3 years ago
Complete the following exercises by applying polynomial identities to complex numbers.
erik [133]

1.)

   =(x-8i)(x+8i)

x^2+8ix-8ix-64i^2

x^2-64i^2

x^2-64(-1)

x^2+64

2.)

    =(4x-7i)(4x+7i)

16x^2+28ix-28ix-49i^2

16x^2-49i^2

16x^2-49(-1)

16x^2+49

3.)

    =(x+9i)(x+9i)

x^2+9ix+9ix+81i^2

x^2+18ix+81(-1)

x^2+18ix-81

4.)

    =(x-2i)(x-2i)

x^2-2ix-2ix+4i^2

x^2-4ix+4(-1)

x^2-4ix-4

5.)

    =[x+(3+5i)]^2

(x+5i+3)^2

(x+5i+3)(x+5i+3)

x^2+5ix+3x+5ix+25i^2+15i+3x+15i+9

x^2+6x+10ix+30i+25i^2+9

x^2+6x+10ix+30i+25(-1)+9

x^2+6x+10ix+30i-25+9

x^2+6x+10ix+30i-16

Hope this helps :)

6 0
3 years ago
A train travels 70 kilometers in 4 hours, and then 55 kilometers in 3 hours. What is its average speed?
Naya [18.7K]

Answer:

Distance = 70 + 55 = 125 kilometers

Time = 4 + 3 = 7 hours

Rate = Distance / Time

Rate = 125 / 7 = 17.8571428571 kilometers per hour

Step-by-step explanation:


6 0
3 years ago
Read 2 more answers
Select the correct answer.
VMariaS [17]

Answer:

C. 90√3

Step-by-step explanation:

5√2 . 9√6 = 45√12 = 45×2√3

= 90√3

4 0
3 years ago
Read 2 more answers
A cube has a side length of 5 inches.
natulia [17]

Answer:

125

Step-by-step explanation:

To find volume you use length x width x height. All sides of a cube or square with always be the same so just use the equation 5 x 5 x 5 to get the answer.

3 0
4 years ago
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