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3 years ago

Will give brainliest! please help!

Mathematics

2 answers:

lana [24]3 years ago

6 0

Answer:

Step-by-step explanation:

Aliun [14]3 years ago

6 0

Answer:

D I'm sure

Step-by-step explanation:

2x - 3 = -x + 3

3x = 6

x = 2

y = 2.2 - 3 (2x-3)

y= 1

y= -2 + 3 (-x+3)

y= 1

(2,1)

Hope this helps ^-^

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Answer:

5:00 o clock

Step-by-step explanation:

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3 years ago

Read 2 more answers

A closed box with a square base is to have a volume of 13 comma 500 cm cubed. The material for the top and bottom of the box cos

andrezito [222]

Answer:

x = 1,5 cm

h = 6 cm

C(min) = 135 $

Step-by-step explanation:

Volume of the box is :

V(b) = 13,5 cm³

Aea of the top is equal to area of the base,

Let call " x " side of the base then as it is square area is A₁ = x²

Sides areas are 4 each one equal to x * h (where h is the high of the box)

And volume of the box is 13,5 cm³ = x²*h

Then h = 13,5/x²

Side area is : A₂ = x* 13,5/x²

A(b) = A₁ + A₂

Total area of the box as functon of x is:

A(x) = 2*x² + 4* 13,5 / x

And finally cost of the box is

C(x) = 10*2*x² + 2.50*4*13.5/x

C(x) = 20*x² + 135/x

Taking derivatives on both sides of the equation:

C´(x) = 40*x - 135*/x²

C´(x) = 0 ⇒ 40*x - 135*/x² = 0 ⇒ 40*x³ = 135

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And h = 13,5/x² ⇒ h = 13,5/ (1,5)²

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3 years ago

Is (-a + b)² = a² - 2ab + b² right or wrong, and why?

antiseptic1488 [7]

Answer:

$\huge\boxed{\sf Right.}$

Step-by-step explanation:

$(-a+b)^2$

Let's apply the formula (x+y)² = x² + 2xy + y²

Here, x = -a and y = b

So,

= (-a)² + 2(-a)(b) + (b)²

= a² - 2ab + b²

Hence, it has been proved that (-a + b)² = a² - 2ab + b².

$\rule[225]{225}{2}$

Hope this helped!

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2 years ago

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Answer:

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Step-by-step explanation:

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