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aleksandrvk [35]
3 years ago
9

What is 5 -( -9) = ?

Mathematics
2 answers:
aleksandr82 [10.1K]3 years ago
8 0
14 because a negative minus a negative is a positive; you add a line and change the sign
zalisa [80]3 years ago
8 0

Answer:

14

Step-by-step explanation:

5-(-9)=

5+9=14

subtracting by a negative is the same as adding the positive so it would be 5+9

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By switching service providers, a family's telephone bill decreased from about $50 a month to about $47 a month. What was the pe
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3 years ago
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....................
Viefleur [7K]

Answer:

<em>C:</em><em> </em><em>is</em><em> </em><em>co</em><em>rrect</em><em> answer</em>

<em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em><em>-</em>

<em>3 \times  {10}^{5}</em>

7 0
3 years ago
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Suppose an airline policy states that all baggage must be box shaped with a sum of length, width, and height not exceeding 174 i
Leya [2.2K]

Answer:

The square-based box with the greatest volume under the condition that the sum of length, width, and heigth does not exceed 174 in is a cube with each edge of 58 in and a volume of 195112 in^{3}

Step-by-step explanation:

For this problem we have two constraints, that are as follows:

1) Sum of length, width, and heigth not exceeding 174 in

2) Lenght and width have the same measure (square-based box)

We know that volume is equal to the product of all three edges, and with the two conditions into account we have the next function:

V=(w^{2})(174-2w)\\V=174w^{2}-2w^{3}

The interval of interest of the objective function is [0, 87]

This problem requieres that we maximize the function that defines the volume. We start calculating the derivative of the function, wich is:

V'=348w-6w^{2} \\V'=(348-6w)(w)

We need to remember that the derivative of a function represents the slope of said function at a given point. The maximum value of the function will have a slope equal to zero.

So we find the value in wich the derivative equals zero:

0=(348-6w)(w)\\w_1=0\\w_2=348/6=58

The first value (w=0) will leave us with a 'height-only box', so the answer must be w=58 in

The value is between the interval of interest.

And, once we solve for the constraints, we have that:

Lenght = Width = Heigth = 58 in

Volume = 195112 in^{2}

8 0
3 years ago
What is the answer to this equation 2/3x +7= 5
nadezda [96]

Answer:

x = -3

Step-by-step explanation:

\frac{2}{3} x + 7 = 5\\\frac{2}{3} x = 5 - 7\\\frac{2}{3} x = -2\\x = -2 / \frac{2}{3}\\x = -2 * \frac{3}{2}\\x = -6/2\\x = -3

5 0
3 years ago
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