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notsponge [240]
2 years ago
12

If n = 5 and r = 3 Find "Cr.​

Mathematics
2 answers:
Marat540 [252]2 years ago
3 0

Answer:

Cr = 10

Step-by-step explanation:

To calculate combinations we use the nCr formula: nCr = n! / r! * (n - r)!, where n = number of items, and r = number of items being chosen at a time.

C(n,r)=[?]

C(n,r)=C(5,3)

=\frac{5}{(3!(5-3)!)}

=\frac{5!}{3!*2!}

=10

[RevyBreeze]

Lena [83]2 years ago
3 0

Answer:

Pi*r^2

Step-by-step explanation:

If your finding circumfrence the equation is Pi*r^2

So your equation would be 3.14*3^2

So 3^2 would be 3*3=9

Multiply 9 by 3.14

your answer would be 28.26

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Solve this problem y=(x-3)^2 when x=9​
atroni [7]
Y=36

it basically says y=(9-3)^2
which is y=6^2
which is then y=36
3 0
3 years ago
After grabbing some food from the cafeteria, Ray trips causing his food to go up in the air before hitting the ground. The parab
Dahasolnce [82]

The maximum height of the tray is 1.8 meters and the tray is in the air for 2 seconds

<h3>The maximum height of the tray</h3>

The distorted information (i.e. the function) in the question is:

h(t) = -0.2t^2 + 0.4t + 1.6

Differentiate the function

h'(t) = -0.4t + 0.4

Set to 0

-0.4t + 0.4 = 0

Subtract 0.4 from both sides

-0.4t = -0.4

Divide by -0.4

t = 1

Substitute t = 1 in h(t) = -0.2t^2 + 0.4t + 1.6

h(1) = -0.2(1)^2 + 0.4(1) + 1.6

Evaluate

h(1) = 1.8

Hence, the maximum height of the tray is 1.8 meters

<h3>Time spent in the air</h3>

In (a), we have:

t = 1

This represents the time to reach the maximum height.

The time spent in the air is:

T = 2t

This gives

T = 2 * 1

T = 2

Hence, the tray is in the air for 2 seconds

Read more about quadratic functions at:

brainly.com/question/11535666

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7 0
1 year ago
Help I just not that smart ​
Lubov Fominskaja [6]

Answer:

1\frac{1}{9}  gallons of paint

Step-by-step explanation:

paint =

2/3 ---- 3/5

x ----  1

x = \frac{\frac{2}{3} }{\frac{3}{5} } =\frac{(2)(5)}{(3)(3)} =\frac{10}{9}

x=1\frac{1}{9}

Hope this helps

4 0
2 years ago
Read 2 more answers
8. A stock decreases $11 a day for 9 days. Which integer represents the total decrease?
user100 [1]

Answer:

D. 99

Step-by-step explanation:

Well they were losing money so 11 times 9 = 99

3 0
3 years ago
Read 2 more answers
Angle 1 and Angle 2 are complementary angles. Angle 1 is 5x degrees. Angle 2 is 50 degrees. Find the value of x. Type ONLY the n
jenyasd209 [6]

Answer:

x = 8

Step-by-step explanation:

complementary angles sum to 90°

sum the 2 angles and equate to 90

5x + 50 = 90 ( subtract 50 from both sides )

5x = 40 ( divide both sides by 5 )

x = 8

3 0
1 year ago
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