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nikklg [1K]
3 years ago
5

There are a total of 122 countries in Africa, Europe, and North America (as of 2003). Europe has twice as many countries as Nort

h America, and Africa has seven more than Europe. How many countries are in each of these three countries?
Mathematics
1 answer:
Eddi Din [679]3 years ago
8 0
A + E + N = 122
E = 2N
A = 7 + E....A = 7 + 2N

(7 + 2N) + 2N + N = 122
5N + 7 = 122
5N = 122 - 7
5N = 115
N = 115/5
N = 23 <== North America

E = 2N
E = 2(23)
E = 46 <== Europe

A = 7 + E
A = 7 + 46
A = 53 <=== Africa
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If I have 4 A’s and 1 B, what is my GPA?
svetoff [14.1K]

Answer:

3.8

Step-by-step explanation:

Hey! Let's start by assuming that these are all normal courses, and that <u>GPA is given by the following scale:</u>

A - 4.0

B - 3.0

C - 2.0

D - 1.0

F - 0.0

That said, this question really just involves calculating the averages.

To find the average, we add all the values together and divide the sum by the total number of values.

<u>Therefore, our expression would look like:</u>

(4.0 + 4.0 + 4.0 + 4.0 + 3.0)/5

This is because there are 5 total values.

Simplify:

19/5

3.8

This means your GPA would be 3.8

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2 years ago
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Solve for the indicated variable 3x - y = 10; y
VashaNatasha [74]

Answer:

y = 3x - 10

Step-by-step explanation:

Starting with 3x - y = 10, add y to both sides:

3x = 10 + y

Then subtract 10 from both sides:

3x - 10 = y

If you switch the sides of the equation, it can also be written as:

y = 3x - 10

7 0
3 years ago
Find the Range and Domain of the Binary relations
sukhopar [10]

Answer:

A = {3,5,6}

B = {1,3}

<u><em>A x B</em></u> = {(3,1),(3,3),(5,1),(5,3),(6,1),(6,3)}

Domain of A x B = (The x figures in ascending order)

=> {3,5,6}     (Figures repeating more than once must be written only 1 time)

Range of A x B = (The y figures in ascending order)

=> {1,3}

<u><em>B x A </em></u>= {(1,3),(3,3),(1,5),(3,5),(1,6),(3,6)}

Domain of B x A = {1,3}

Range of A x B = {3,5,6}

8 0
4 years ago
19. 140% of 60<br> find the percent of the number. Explain your method
KonstantinChe [14]

Answer:

84

Step-by-step explanation:

is                    x           140

----   SO ...    -------  =  --------

of                  60         100

(hit like pls)

60*140=100x

8400=100x

/100     /100

-------------------

   84 = x

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