3 years ago

What is the average of 22.10, 13.45, 25.10, 17.20, 19.10?

Mathematics

1 answer:

Nookie1986 [14]3 years ago

5 0

I got 19.39 by adding all og those numbers together and dividing by 5

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Which would be the best method to use to solve the following equations? Explain your reasoning.

o-na [289]

A. square root property

$3x^2-192=0\\x^2-66=0\\x^2=66\\x= -\sqrt{66} or \sqrt{66}$

it has one value with x which is x^2 and it cn be easily solved without having to factorise, quadratic formula cant be used as it need ax^2+bx+c=0 format

B. factorising

$x^2-x-6=0\\x^2+2x-3x-6=0\\(x+2)(x-3)=0\\x+2=0 and x-3=0\\x= -2 \\x= 3$

i just felt like this was easier to factorise than the other 2 options left

C. Completing the square

$x^2-6x-7=0\\(x-3)^2=0\\x= -1\\x= 7$

same reason personal preference

D- Quadratic

$x^2-17x-7=0\\x=\frac{-(-17)+\sqrt{(-17)^2-4(1)(-7)} }{2(1)} \\x=\frac{-(-17)-\sqrt{(-17)^2-4(1)(-7)} }{2(1)}\\x=17.4\\x=-0.402$

the 17 kinda threw me off and i didnt wanna get on factorising or doing completing the square so quadratic formal

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3 years ago

What is the domain of y=log5x

aliina [53]

The answer is both all real numbers less than 0 and all real numbers greater than 0

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2 What is the cause of the economie problem facing all countries?

anyanavicka [17]

the answer is uneven distribution of income and wealth

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8x-31 ≥-7

Vinvika [58]

X>3 for the first one

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(2^2 + 8) x 7 solve the following problem

tekilochka [14]

Answer:

Step-by-step explanation:

2^2=4

4 + 8=12

12 times 7= 84

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