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3 years ago

What is −4 − (−1) pleaseeeeeeeeeeeee help

Mathematics

2 answers:

faltersainse [42]3 years ago

7 0

= -4-(-1)
= -4+1
= -3
Hope it helps
Thank you..

Anuta_ua [19.1K]3 years ago

5 0

The answer would be −3 because in the equation you are taking away −1 from −4. A negative minus a negative is basically subtracting with positives.

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Answer:

x = 1,5 cm

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Step-by-step explanation:

Volume of the box is :

V(b) = 13,5 cm³

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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

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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

x³ = 3.375

x = 1,5 cm

And h = 13,5/x² ⇒ h = 13,5/ (1,5)²

h = 6 cm

C(min) = 20*x² + 135/x

C(min) = 45 + 90

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Step-by-step explanation:

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The z-score, for any arbitrary life span of x year, is given by

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By using the given values, we have

$z=\frac{x-18}{2.6} \cdots(i)$

The z-score for x=24, by using equation (i), is

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