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Soloha48 [4]
4 years ago
12

A professor must randomly select 4 students to participate in a mock debate. There are 15 students in his class. In how many dif

ferent ways can these students be selected, if the order of selection does not matter? A. 445 B. 989 C. 32,760 D. 1,365
Mathematics
1 answer:
Vikki [24]4 years ago
7 0

For apex users, the answer is 1,365


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PLEASE HELP! Urgent!!!
zaharov [31]

Answer:

\frac{9}{2}\pi +35

Step-by-step explanation:

The area of trapezoid is given by the formula:

A=\frac{1}{2}(b_1+b_2)h

Where

A is the area

b_1 is base 1

b_2 is base 2, and

h is the height

Looking at the figure, base 1 is the left line which goes from y = 3 to y = 3, so 6 units. Also, base 2 is the right line which goes from y = -3 to y =5, so 8 units.

The height is the horizontal distance in the middle, which goes from x = -2 to x = 3, so 5 units. Hence area of trapezoid is:

A=\frac{1}{2}(b_1+b_2)h\\A=\frac{1}{2}(6+8)*5\\A=35

Now, area of semicircle is:

A=\frac{\pi r^2}{2}

Where

A is the area

r is the radius

Looking at the figure, the diameter (twice radius) goes from y = -3 to y = 3, so 6 units. But radius is half of that, so 3 units. Hence area of semicircle is:

A=\frac{\pi r^2}{2}\\A=\frac{\pi (3)^2}{2}\\A=\frac{9}{2} \pi

Total area of the figure is \frac{9}{2}\pi +35

4 0
4 years ago
3. At a poster shop, Han paid $16.80 for 2 large posters and 3 small posters of his
Sunny_sXe [5.5K]

Answer:

small posters cost $2.30 each

large posters cost $4.95 each

Step-by-step explanation:

Let

price of large poster be "l", and

price of small poster be "s"

$16.80 for 2 large and 3 small, we can write:

2l + 3s = 16.80

Then,

$14.15 for 1 large and 4 small, we can write:

l + 4s = 14.15

We can write this as:

l = 14.15 - 4s

Now we substitute this expression for "l" into first equation and solve for s first:

2l+3s=16.80\\2(14.15 - 4s)+3s=16.80\\28.30-8s+3s=16.80\\5s=11.5\\s=2.30

small posters cost $2.30 each

Now, we know l = 14.15 - 4s, so

l = 14.15 -4(2.30)

l = 4.95

large posters cost $4.95 each

7 0
4 years ago
Angles 1 and 2 are supplementary. 2 lines intersect to form angles 1 and 2. Which equation represents the relationship between t
LenKa [72]

Answer:

Step-by-step explanation: A

8 0
3 years ago
Read 2 more answers
Thanks
Damm [24]
A) and D) is the answer
A) for number 1 and D) for number 2
6 0
3 years ago
Which shapes can the shaded area be divided into to find the area?
Greeley [361]
The second to last option is correct because a rectangle can fit into a trapezoid
3 0
3 years ago
Read 2 more answers
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