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3 years ago

My last math question! Plz help if you can and it asks for the elimination method. thank you!

Mathematics

1 answer:

Galina-37 [17]3 years ago

6 0

I've found a Programm that calculates it for you...
x=0.6666667
I don't know if that's correct or helpful but here you go :)

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Keith buys a house for £270 000 and sells it two years later for £300 000.

Reika [66]

Answer:11% to 2 s.f

Step-by-step explanation:

P=sp-cp over cp ×100%

Sp=€300000 cp=€270000

P=300000-270000 over 270000 ×100%

P=11.111%

11 To 2 s. f

7 0

4 years ago

Find the mean of 25 numbers if the mean of 15 of them is 18 and the mean of the rest is 13

sergij07 [2.7K]

Given the mean of 15 of them is 18 and the mean of the rest is 13

And the total numbers are 25

So,

First, we need to find the sum of all numbers

the mean of 15 of them is 18

so, the sum of the 15 numbers are = 18 * 15 = 270

The rest of the numbers = 25 - 15 = 10

the mean of the rest is 13

so, the sum of the rest = 13 * 10 = 130

so, the sum of all numbers = 270 + 130 = 400

so, the mean of the all numbers =

$\frac{400}{25}=16$

So, the answer is, mean = 16

7 0

2 years ago

4x^1/2 to radical form

Lyrx [107]

$x^ \frac{m}{n}= \sqrt[n]{x^m}$
pemdas, so exponent first before multiply
4(x^1/2)=4x^2
this is different from
(4x)^1/2

so

$x^ \frac{1}{2}= \sqrt[2]{x^1}$
times that by 4
4√x

7 0

3 years ago

Read 2 more answers

Simplify the polynomial expression given below.<br><br> (2x − 1)(2x2 + 5x + 3) + (3x + 6)

fenix001 [56]

Answer:

$4x^{3}+8x^{2} +4x+3$

Step-by-step explanation:

Hello

To simplify the polynomial we must eliminate the parentheses

by definition

$ax^{n}*bx^{m} =abx^{n+m}$

$(2x-1)(2x^{2} +5x+3)+(3x+6)\\(4x^{3} +10x^{2} +6x-2x^{2} -5x-3)+(3x+6)\\\\We\ add\ the\ similar\ terms\\\\(4x^{3}+8x^{2} +x-3)+(3x+6)\\\\4x^{3}+8x^{2} +4x+3$