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2 years ago

Necesito las respuestas

Mathematics

1 answer:

Stels [109]2 years ago

3 0

Answer:

I need it in English please so I can helps

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Which of the following equals 140 to nearest 10

jarptica [38.1K]

<span>Which of the following equals 140 to nearest 10
A.134

B.145

C.136

D.146</span>

6 0

3 years ago

Solve for x and y 1/(x+yi) + 2/(x-yi) = 1+i

aliina [53]

Answer:

Step-by-step explanation:

x+i*y≠0 ==> x≠0 and y≠0

x-i*y≠0 ==> x≠0 and y≠0

We must exclude (0,0) as solution.

$\dfrac{1}{x+i*y} +\dfrac{2}{x-i*y} =1+i\\\\\dfrac{1*(x-i*y)}{(x+i*y)(x-i*y)} +\dfrac{2*(x+i*y)}{(x-i*y)(x+i*y)} =1+i\\\\\\\dfrac{x-i*y+2x+2i*y}{x^2+y^2} =1+i\\\\3x+i*y=(1+i)(x^2+y^2)\\\\3x+i*y=(x^2+y^2)+i(x^2+y^2+i*(x^2+y^2)\\\\\left\{\begin{array}{ccc}3x&=&x^2+y^2\\y&=&x^2+y^2\\\end {array}\right.\\\\\\\left\{\begin{array}{ccc}y&=&3x\\3x&=&x^2+9x^2\\\end {array}\right.\\\\\\\left\{\begin{array}{ccc}y&=&3x\\x(10x-3)&=&0\\\end {array}\right.\\\\$

$\left\{\begin{array}{ccc}x&=&0\\y&=&0\\\end {array}\right.\ (to\ exclude) \ or \ \left\{\begin{array}{ccc}x&=&\dfrac{3}{10}\\\\y&=&\dfrac{9}{10}\\\end {array}\right.\\\\Sol=\{(\dfrac{3}{10},\dfrac{9}{10})\}\\$

4 0

3 years ago

Explain how you would use<br> an area model to show 3 x 19.

Triss [41]

Answer:

You would draw a rectangle that has 3 rows of 19 squares.

This would represent 3 times 9.

Step-by-step explanation:

7 0

3 years ago

A square has a perimeter of 148 inches. How do you find the length of the diagonal of the square?

Sidana [21]

Answer:

52.33 inches

Step-by-step explanation:

Multiply the length of one side by the square root of 2.

In this case: 37, you would divide that by the square root of 2.

Hope this helps!

6 0

4 years ago

A car costs £14000. Work out the price after an 8% discount

Semenov [28]

Answer:

13999.92

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers