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Ksenya-84 [330]
3 years ago
13

There are 25 students that would like to go on a field trip, but only 18 may go. How many different combinations of students cou

ld go on the trip.
Mathematics
1 answer:
Naya [18.7K]3 years ago
6 0

480700. The different combinations of students that could go on the trip with a total of 25 student, but only 18 may go, is 480700.

The key to solve this problem is using the combination formula nC_{r}=\frac{n!}{r!(n-r)!}. This mean the number of ways to choose a sample of r elements from a set of n distinct objects where order does not matter and replacements are not allowed.

The total of students is n and the only that 18 students may go is r:

25C_{18}=\frac{25!}{18!(7!)}=480700

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Help please thank you!!!!
Nana76 [90]
1. You have that:

 - The trapezoids are similar.
 - The larger  base of the smaller trapezoid is 18 m and its area is 310 m².
 - The larger base of the larger trapezoid is 32 m.

 2. Then:

 Sides=18/32
 Sides=9/16

 Area=(9/16)²
 Area=81/256

 3. Now, you can find the area of the larger trapezoid, as below:

 81/256=310/x
 81x=(310)(256)
 x=79360/81
 x=980 m²

 Therefore, the answer is: The area of the larger trapezoid is 980 m².
4 0
3 years ago
At a bead store, glass beads cost $2.85 per ounce. What is the price for 8.6 ounces of glass beads?
Zielflug [23.3K]
(2.85)(8.6) = $24.51
4 0
3 years ago
Read 2 more answers
The value of 2 in 2000 is_times the value in 200
VARVARA [1.3K]
2000/200 is 100!! so it will be 100
5 0
2 years ago
Determine the equation of the circle graphed below .
Volgvan

Answer:

(x+1)^2 + (y-7)^2 = 2^2

Step-by-step explanation:

The center of the circle is at (-1,7) and the radius from the center to the edge is 2, so the equation should look like (x-h)^2 + (y-k)^2 = r^2

You would flip the signs of the center so that when you solve the equation it ends up in the correct place.

3 0
3 years ago
The scores on a test are normally distributed with a mean of 80 and a standard deviation of 16. What is the score that is 2 stan
galina1969 [7]

The deviation from 80 of about 16 is normal.

So the lowest is usually 80 - 16 = 64 and the highest is 80 + 16 = 96

But now we have a "deviation" that is 2 standard deviations above the mean score.

So 80 + 16 + 16 = 112 is this score.

Hope this helps.

r3t40

4 0
3 years ago
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