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4 years ago

What's the answer for 4+5i and 3+i

Mathematics

2 answers:

NNADVOKAT [17]4 years ago

4 0

(4 + 5i) + (3 + i) = (4 + 3) + (5 + 1)i = 7 + 6i

Kamila [148]4 years ago

3 0

That's simply a list of two complex numbers. There's no question asked.

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Describe and correct the error in solving the proportion?

Ilia_Sergeevich [38]

Answer: Choice B

They did not perform the cross multiplication properly

The correct step should be m*24 = 8*15 which solves to m = 5

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Explanation:

In general, if we had the equation A/B = C/D, then it cross multiplies to A*D = B*C. We refer to this as cross multiplication because of the shape made when we connect the terms (to figure out what multiplies with what). The diagram below shows what I mean.

So that's why m/8 = 15/24 cross multiplies to m*24 = 8*15

Simplifying things a bit leads to 24m = 120. Then we divide both sides by 24 to fully isolate m and we get m = 120/24 = 5. Therefore, m = 5.

7 0

3 years ago

Evaluate the following expressions. Let a = 5, b = -4, and c = 10.

frozen [14]

Answer: -20, 6, 2, 5

Step-by-step explanation:

a = 5, b = -4, c = 10

12. ab = 5(-4) = -20

13. b + c = -4 + 10 = 6

14. c/5 = 10/5 = 2

15. c - 5 = 10 - 5 = 5

3 0

3 years ago

6,666,666×666,666 /1+2+3+4+5+6+5+4+3+2+1 − 777,777×777,777/1+2+3+4+5+6+7+6+5+4+3+2+1

jeka57 [31]

Answer:

111111 $\times$ 1111110 is the simple expression.

Step-by-step explanation:

The expression to be solved:

$\dfrac{6,666,666\times666,666 }{1+2+3+4+5+6+5+4+3+2+1} - \dfrac{777,777\times777,777}{1+2+3+4+5+6+7+6+5+4+3+2+1}$

First of all, let us solve the first term:

$\dfrac{6,666,666\times666,666 }{1+2+3+4+5+6+5+4+3+2+1}\\\Rightarrow \dfrac{6666666\times666666 }{36}\\\Rightarrow \dfrac{6666666\times666666 }{6\times 6}\\\Rightarrow 1111111\times 111111$

Now, the right term:

$\dfrac{777777\times777777}{1+2+3+4+5+6+7+6+5+4+3+2+1}\\\Rightarrow \dfrac{777777\times777777}{49}\\\Rightarrow \dfrac{777777\times777777}{7 \times 7}\\\Rightarrow 111111 \times 111111$

So, the expression to be solved becomes:

$1111111\times 111111-111111\times 111111\\\Rightarrow 111111(1111111-1)\\\Rightarrow 111111\times 1111110$

3 0

3 years ago

A box has a length of 2x+2 and the width of x-2 has a primiter of 90 cm. if the hight of the box is x what is the volume of the

bixtya [17]

We know that
volume of the box=length*width*height

length=2x+2
width=x-2
height=x

perimeter of the box=2*[length+width]
90=2*[2x+2+x-2]----> 90=2*3x-----> 6x=90----> x=15 cm
so
length=2x+2----> 2*15+2----> 32 cm
width=x-2------> 15-2----> 13 cm
height=x------> 15 cm

volume of the box=32*13*15-----> 6240 cm³

the answer is
6240 cm³

8 0

3 years ago

Sampson has a list of items that are on sale to pick up at the store. The sale items are the following:

olchik [2.2K]

Answer:

the answer is A) Yes, Sampson's receipt is correct.

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers