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Neporo4naja [7]
3 years ago
6

Find the sum of the given arithmetic series. 27 + 20 + 13 + 6 + ... + (–36) a. –45 c. 315 b. –9 d. –90

Mathematics
1 answer:
Zielflug [23.3K]3 years ago
3 0
r=20-27=-7 \\  \\ a_{1}=27 \\  \\ a_{n}=a_{1}+(n-1)r \\  \\ -36=27+(n-1)*(-7) \\  \\ -7(n-1)=-63 \\  \\ n-1=9 \\  \\ n=10 \\  \\ S_{10}= \frac{27-36}{2}*10=-9*5=-45

<em>\\\ Ben</em>
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Please help
Liono4ka [1.6K]

Answer:

P(red) = .3

P(yellow) = .3

75 cubes in the box

Step-by-step explanation:

The probability has to add to 1

Since the number of red cubes equals the number of yellow cubes the probability has to be the same

.4 + x+x = 1

.4 +2x = 1

2x = 1-.4

2x = .6

Divide by 2

x = .6/2

x = .3

P(red) = .3

P(yellow) = .3

We know that

P(blue) = .4 = number of blue cubes/ total number of cubes

                 .4 = 30/total

                  total = 30/.4

                   total = 75

7 0
3 years ago
Does anyone know this?
seropon [69]

Answer:

-124

Step-by-step explanation:

The equation for a discriminant is:

b^{2} -4ac

So for

7x^{2} -4x +5=0

a = 7         b = - 4          c = 5

Plug values into the equation.

(-4)^{2} -4(7)(5)

16 - 140 = -124

3 0
3 years ago
Read 2 more answers
Match the like terms.
KatRina [158]

Answer:

5a

Step-by-step explanation:

4 0
3 years ago
Find the value of x.<br> 3x -8°<br> 2x + 1°
Naddik [55]
1= x=2 2/3 2= x=1/2 this is cause you must get x alone so you have to move the “-8,1” over the then divide it by the number in front of x pls mark brainliest
5 0
2 years ago
Does this table represent a function? Why or why not?
Rasek [7]
By definition we have to:

 A mathematical function is a relationship that is established between two sets, through which each element of the first set is assigned a single element of the second set or none.
 The initial set or starting set is also called the domain; the final set or set of arrival, meanwhile, can be called codomain.

 For this case, the table represents a function and the function is linear because the rate of change (slope) is constant and equal to 200.

 Answer:
 option D
7 0
3 years ago
Read 2 more answers
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