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exis [7]
3 years ago
7

What is the sum of the first 20 terms of the series 3 + 14 + 25 + 25 + 36 +

Mathematics
2 answers:
Fynjy0 [20]3 years ago
6 0

Answer:

S _{20} = 2150

Step-by-step explanation:

a _{1} = 3 \\ a _{2} = 14 \\ d = a _{2} - a_{1}  = 14 - 3 = 11 \\ n = 20

S _{n} =  \frac{n}{2} (2a + (n - 1)d) \\  \\ S _{20} =  \frac{20}{2} (2(3) + (20 - 1) \times 11) \\  \\ S _{20} = 10 \times (6 + 19 \times 11) \\ S _{20} = 10 \times (6 + 209) \\ S _{20} = 10 \times 215 \\ S _{20} = 2150

Luba_88 [7]3 years ago
5 0
2150 is the correct answer
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3 years ago
30 POINTS! Consider the system of linear equations and the matrix equations below.
fiasKO [112]

Answer:

Option C is correct.

Step-by-step explanation:

-x+3y=2

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\left[\begin{array}{cc}-1&3\\4&-2\end{array}\right] \left[\begin{array}{c}x&y\end{array}\right] =\left[\begin{array}{c}2&22\end{array}\right]

AX=B

X = A^{-1}B

A^{-1} = |A|/Adj A

|A| = (-1)(-2)-(3)(4)

|A| = 2-12

|A| = -10

Adj A = \left[\begin{array}{cc}-2&-3\\-4&-1\end{array}\right]

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X= A^-1 B

X = 1/10\left[\begin{array}{cc}2&3\\4&1\end{array}\right]\left[\begin{array}{c}2&22\end{array}\right]

X=1/10X=1/10\left[\begin{array}{c}2*2+3*22\\4*2+1*22\end{array}\right]\\X=1/10\left[\begin{array}{c}4+66\\8+22\end{array}\right]\\X=1/10\left[\begin{array}{c}70\\30\end{array}\right]\\X=\left[\begin{array}{c}70/10\\30/10\end{array}\right]\\X=\left[\begin{array}{c}7\\3\end{array}\right]

So, x = 7 and y =3

Hence Option C is correct.

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3 years ago
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