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melisa1 [442]
3 years ago
11

A blood bank needs 6 people to help with a blood drive. 13 people have volunteered. Find how many different groups of 6 can be f

ormed from the 13 volunteers.
Mathematics
2 answers:
Ghella [55]3 years ago
8 0

Answer:

the answer is two groups. six times two is 12, 12 is one less than 13 but six cannot go into one

Reptile [31]3 years ago
5 0

Answer:

1716

Step-by-step explanation:

13C6= 1716 (Uses combinations)

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Equivalent to x^3+3x^2-x+2x^2+6x-2 after it has been simplified
natima [27]

Answer:

x³ + 5x² + 5x - 2

Step-by-step explanation:

Given

x³ + 3x² - x + 2x² + 6x - 2 ← collect like terms

= x³ + (3x² + 2x² ) + (- x + 6x ) - 2

= x³ + 5x² + 5x - 2

4 0
3 years ago
10,13,14,17,22,25 find the mean
grin007 [14]

Median = 15.5

Please take a look at the image attached for an explanation.

3 0
2 years ago
Read 2 more answers
15 points and Will give branliest !!
prisoha [69]

Answer:

Midpoint of a line segment with the endpoints A(a1, a2), B(b1, b2) is M(1/2*(a1 + b1), 1/2*(a2 + b2))

So,

(1/2*(-4 + 7), 1/2*(-3 + (-5))) = (1/2*3, 1/2*(-8)) = (1.5, -4)

Answer D is correct.


8 0
3 years ago
100 points / please help, im lost
Yakvenalex [24]

Answer:

12:15 is NOT proportional to 3:4

Step-by-step explanation:

7.5:10 is proportional to 3:4 because 3×2.5=7.5, and 4×2.5=10.

39:52 is proportional to 3:4 because 3×13=39, and 4×13=52

45:60 is proportional to 3:4 because 3x15=45, and 4×15=60

12:15 is not proportional to 3:4 because while you can multiply 3x4=12, you can not multiply 4×4 to get 15, you get 16 instead.

8 0
2 years ago
Read 2 more answers
The level of water in a dam was decreasing by 20% each day. If the level of water was 1500cm,what was the level after two days?
makkiz [27]

Answer:

L_o= 1500 cm

And we know that the level is decreasing 20% each day so then we can use the following model for the problem

L_f = L_o (1-0.2)^t

Where t represent the number of days and L the level for this case we want to fnd the level after two days so then t =2 and replacing we got:

L_f = 1500cm(0.8)^2 = 960cm

Step-by-step explanation:

For this case we know that the initial volume of water is:

L_o= 1500 cm

And we know that the level is decreasing 20% each day so then we can use the following model for the problem

L_f = L_o (1-0.2)^t

Where t represent the number of days and L the level for this case we want to fnd the level after two days so then t =2 and replacing we got:

L_f = 1500cm(0.8)^2 = 960cm

6 0
3 years ago
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