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melisa1 [442]
3 years ago
12

Hurry please!

Mathematics
1 answer:
n200080 [17]3 years ago
4 0

Answer:

A. the rational number system is closed under addition, but not multiplication

Step-by-step explanation:

may i pleaseee have brainliest

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1. Bill decided to buy six books on history instead
bulgar [2K]

Answer: 2/3 books on politics

Step-by-step explanation:

The opportunity cost of something is the next best alternative that you would have taken if you did not instead go for the option that you took.

Opportunity cost here is the number of books on politics that Bill had to give up to get a single book on history.

= Number of politics books / Number of history  books

= 4 / 6

= 2/3 books on politics

<em>Bill gave up 2/3 books on politics to get a single history book. </em>

6 0
3 years ago
Need help with this. Hope someone can help
ratelena [41]

First, convert all of the cm measurements to m measurements (so they are all the same unit measurement)

2000 cm = 20 m         800 cm = 8m    

<u>Total Perimeter </u>(Note that circumference of a semi-circle is 2 π r/2 = π r)

Add up the lengths of all of the outside edges. I am going to start on the top and move counter-clockwise:

40 + π (10) + 8 + 25 + 8 + (40 - 25 - 10) + 8 + 10 + 8 + π(10)

= 40 + 10π + 41 + (5) + 26 + 10π

= 112 + 20π

= 112 + 62.8

= 174.8

Answer: 174.8 m

<u>Total Area</u>

Split the picture into 5 sections (2 semi-circles, top rectangle, bottom left rectangle, and bottom right rectangle).  Find the area for each of those sections and then add their areas together to find the total area.

2 semi-circles is 1 Circle: A = π · r²  ⇒ A = π(20/2)² =  π(10)²  = 100π  ≈  314

top rectangle: A = L x w  ⇒  A = 40 x 20  = 800

bottom left rectangle: A = L x w  ⇒  A = 25 x 8  = 200

bottom right rectangle: A = L x w  ⇒  A = 10 x 8  = 80

Total = 314 + 800 + 200 + 80  = 1394

Answer: 1394 m²


3 0
3 years ago
Please help with #22! You don’t have to fully explain.
trasher [3.6K]
The answer to the first part is 3 1/2 and the answer to the second question is 2/7
3 0
3 years ago
How many solutions does the following equation have ? -3x+9-2x=-12-5x?
Maurinko [17]

Answer:

0.....................

5 0
3 years ago
Suppose that a college student is taking three courses: a two-credit course, a three-credit course, and a four-credit course. Th
Colt1911 [192]

Answer:

3.11

Step-by-step explanation:

[(3.5)(2) + (3)(3+4)] ÷ 9

(7 + 21)/9 = 28/9

3.111111

3.11

6 0
3 years ago
Read 2 more answers
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