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LuckyWell [14K]

3 years ago

7

Sadie has a blue ribbon and a red ribbon. The blue ribbon is 12 inches long. The blue ribbon is 3 times longer than the red ribb

on.
Which operation would be best to use to determine the length of the red ribbon?

addition

division

multiplication

subtraction

1 answer:

yanalaym [24]3 years ago

7 0

Multiplication it says time 3 so 12 times 3 is 36

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What is the surface area of a cube that has a side length of 8 mm?

nikklg [1K]

Surface area of a cube = 6l²

Now given length = l = 8 mm

= 6*8² = 6*64 = 384 mm².

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1/2 - 2/9 =<br><br>subtract. Simply if possible.

kozerog [31]

Answer:

$\frac{5}{18}$

Step-by-step explanation:

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The first three terms of an arithmetic sequence are as follows.

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Answer:

13, 8, 3

Step-by-step explanation:

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Mark me as the brainliest please, Thank you!

7 0

2 years ago

PLEASE HELP ME WITH THIS! ASAP!!!!!!!

marusya05 [52]

Hold on i believe its C but let me go look on google and i'll get back to you to sure

3 0

3 years ago

Number 1 and 2 please (25 points)

Elenna [48]

Answers:

1) $(3x+2)+(4-5x)=-2x+6$

$(3+2i)+(4-5i)=7-3i$

2) $(1-3x)(2+x)=-3x^{2}-5x+2$

$(1-3i)+(2+i)=5-5i$

Step-by-step explanation:

In mathematics there are rules related to complex numbers, specifically in the case of addition and multiplication:

<u>Addition: </u>

If we have two complex numbers written in their binomial form, the sum of both will be a complex number whose real part is the sum of the real parts and whose imaginary part is the sum of the imaginary parts (similarly as the sum of two binomials).

For example, the addition of these two binomials is:

$(3x+2)+(4-5x)=3x-5x+2+4=-2x+6$

Similarly, the addition of two complex numbers is:

$(3+2i)+(4-5i)=3+4+2i-5i=7-3i$ Here the complex part is the number with the $i$

<u>Multiplication: </u>

If we have two complex numbers written in their binomial form, the multiplication of both will be the same as the multiplication (product) of two binomials, taking into account that $i^{2}=-1$ .

For example, the multiplication of these two binomials is:

$(1-3x)(2+x)=2+x-6x-3x^{2}=-3x^{2}-5x+2$

Similarly, the multiplication of two complex numbers is:

$(1-3i)+(2+i)=2+i-6i-3i^{2}=2-5i-3(-1)=5-5i$

8 0

3 years ago