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Pani-rosa [81]
3 years ago
6

6x + 11 = 21 Help I’m on a quiz and this question is so confusing

Mathematics
1 answer:
Westkost [7]3 years ago
3 0

Answer:

Step by Step Solution

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                    6*x+11-(21)=0  

Step by step solution :

STEP

1

:

Pulling out like terms

1.1     Pull out like factors :

  6x - 10  =   2 • (3x - 5)  

Equation at the end of step

1

:

STEP

2

:

Equations which are never true:

2.1      Solve :    2   =  0

This equation has no solution.

A a non-zero constant never equals zero.

Solving a Single Variable Equation:

2.2      Solve  :    3x-5 = 0  

Add  5  to both sides of the equation :  

                     3x = 5

Divide both sides of the equation by 3:

                    x = 5/3 = 1.667

One solution was found :

x = 5/3 = 1.667

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What is the explicit rule for this geometric sequence? a1=-15;an=1/5•an-1
Ad libitum [116K]

Answer:

Option A is correct.

a_n =-15 (\frac{1}{5})^{n-1}

Step-by-step explanation:

Given: a_1 = -15 ; a_n = \frac{1}{5} \cdot a_{n-1}

for n = 2

a_2 = \frac{1}{5} \cdot a_{2-1} = \frac{1}{5}\cdot a_1 = \frac{1}{5} \cdot (-15)

for n =3

a_3 = \frac{1}{5} \cdot a_{3-1} = \frac{1}{5} \cdota_2= (\frac{1}{5})^2\cdot (-15)

Simlarly , for n =4

a_3 = \frac{1}{5} \cdot a_{4-1} = \frac{1}{5}\cdot a_3= (\frac{1}{5})^3\cdot (-15)

and so on...

Common ratio(r) states that for a geometric sequence or geometric series, the common ratio is the ratio of a term to the previous term.

we have;   r = \frac{a_2}{a_1} = \frac{1}{5}

Now; by recursive formula for geometric series:

a_n = a_1 r^{n-1}

where a_1 is the first term and r is the common ratio:

Substitute the value of a_1 = -15  and  r = \frac{1}{5}

we have;

a_n =-15 (\frac{1}{5})^{n-1}

therefore, the explicit rule for the geometric sequence is; a_n =-15 (\frac{1}{5})^{n-1}

3 0
3 years ago
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