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garri49 [273]
3 years ago
7

Three- eighths of the seventh grade students were taking advanced math at the beginning of the year,but seven dropped out by the

end of the year. If there were 140 students taking advanced math at the end of the year,how many total 7th grade students are there ?
Mathematics
1 answer:
vekshin13 years ago
7 0

392 because if there are 147 taking advanced math at the end of the year then 147 x 3/8 = 392

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THEOREM:

  • Angle sum property —: The sum of interior angles of a triangle is 180°.

ANSWER:

Let the missing angle be x.

By angle sum property,

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So, <u>Correct choice</u> - [C] 80°.

7 0
3 years ago
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Which of the following estimates at a 95% confidence level most likely comes form a small sample?
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2 years ago
Is 4 a solution to the compound inequality “x &lt; 0 and c &lt; 7”
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8 0
3 years ago
3[5x - 4] - [-30 - 45x]
Nimfa-mama [501]
3(5x - 4) - (-30-45x)
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3 years ago
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for the school play adult tickets cost 4$ and children tickets cost 2$ natalie is working at the ticket counter and just sold 20
lilavasa [31]
Let us formulate the independent equation that represents the problem. We let x be the cost for adult tickets and y be the cost for children tickets. All of the sales should equal to $20. Since each adult costs $4 and each child costs $2, the equation should be

4x + 2y = 20

There are two unknown but only one independent equation. We cannot solve an exact solution for this. One way to solve this is to state all the possibilities. Let's start by assigning values of x. The least value of x possible is 0. This is when no adults but only children bought the tickets.

When x=0,
4(0) + 2y = 20
y = 10

When x=1,
4(1) + 2y = 20
y = 8

When x=2,
4(2) + 2y = 20
y = 6

When x=3,
4(3) + 2y= 20
y = 4

When x = 4,
4(4) + 2y = 20
y = 2

When x = 5,
4(5) + 2y = 20
y = 0

When x = 6,
4(6) + 2y = 20
y = -2

A negative value for y is impossible. Therefore, the list of possible combination ends at x =5. To summarize, the combinations of adults and children tickets sold is tabulated below:

   Number of adult tickets             Number of children tickets
                  0                                                   10
                  1                                                    8
                  2                                                    6
                  3                                                    4
                  4                                                    2
                  5                                                    0




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