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iogann1982 [59]
3 years ago
6

Can someone please explain this to me

Mathematics
1 answer:
Gre4nikov [31]3 years ago
8 0

What's happening is that every subtraction can be written as "addition of the opposite."

18-5 = 18 + (-5)

One reason this is done in the work you showed is that they're trying to show why you distribute the negative and the 1 into the parentheses, why you multiply everything in the parentheses by "-1" and not just 1.

The other reason is to later to be able to move the individual terms around, so you'll be able to combine like terms.

When you move terms around, the sign has to stay attached to the term, so writing all the subtractions as addition helps keep the sign attached.

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A container built for transatlantic shipping is constructed in the shape of a right rectangular prism. Its dimensions are 7.5 ft
Yuri [45]

Considering the definition of right rectangular prism and its volume,  the total weight of the contents is 38.81 pounds.

<h3>Right rectangular prism</h3>

A right rectangular prism (or cuboid) is a polyhedron whose surface is formed by two equal and parallel rectangles called bases and by four lateral faces that are also parallel rectangles and equal two to two.

<h3>Volume of right rectangular prism</h3>

To calculate the volume of the rectangular prism, it is necessary to find the product of its dimensions, or of the three edges that converge at a certain vertex.

That is, to calculate the volume of a rectangular prism, multiply its 3 dimensions: length×width×height.

<h3>Volume of the container </h3>

In this case, you know that:

  • the dimensions of the container built are 7.5 ft by 11.5 ft by 3 ft.
  • the container is entirely full and, on average, its contents weigh 0.15 pounds per cubic foot.

So, the volume of the container is calculated as:

7.5 ft× 11.5 ft× 3 ft= <u><em>258.75 ft³</em></u>

Then, the total weight of the contents is calculated as:

258.75 ft³×  0.15 pounds per cubic foot= <u><em>38.8125 pounds≅ 38.81 pounds</em></u>

Finally, the total weight of the contents is 38.81 pounds.

Learn more with this similar problems:

<u>brainly.com/question/13962136</u>

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8 0
2 years ago
Is 3 1/2 cups more or less than 1 liter? Explain or show your reasoning
IceJOKER [234]
3 1/2 is less because 1 liter in cups is 4.227
7 0
3 years ago
Zhang is designing protective packaging. He tests his design by dropping a raw egg protected by his packaging from various heigh
Softa [21]

Answer: 12.034 yards

Step-by-step explanation:

Given the following :

Height to which egg is protected = 11 meters

Converting this height of 11 meters to yards

Let the height in yards = h

1 meter = 1.094 yards

11 meters = h

(1 * h) = (11 * 1.094)

h = 12.034 yards

Hence, the height in yards to which egg is protected = 12.034 yards

4 0
3 years ago
Read 2 more answers
entrance to the fair is 5$ but each ticket for the rides costs x dollars. Write an expression to show the cost of 12 ride ticket
VladimirAG [237]

Answer:

12x+5

Step-by-step explanation:

If each ride is x dollars, and you want 12 tickets, 12 times x is 12x. Then you add the original upfront cost of $5.

3 0
3 years ago
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Tim is 9 years older than 3 times John’s age. If John is 13 years old, how old is Tim?
oee [108]

Answer:

48

Step-by-step explanation:

3 times 13 (john's age) = 39

39 + 9 = 48 (nine years older than 3 times (39) so you add 9)

Therefore, Tim is 48.

4 0
3 years ago
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