Arithmetic Sequences # 3

 $a_4\ =\ a_5\ +\ 10$  

 $a_{4\ }=\ a_5\ +\ 22$  

 $a_{5\ \ }=\ a_4\ +\ 10$  

 $a_5=\ a_4\ +\ 22$  

None of these

$a_{5\ }=\ a_6\ +\ 9$

$a_6\ =\ a_5\ +\ 18$

$a_6\ =\ a_{5\ }+\ 9$

$a_{5\ }=\ a_6\ +\ 18$

None of these.

$a_n=75+25\left(n-1\right)$

$a_n\ =\ 125-25\left(n-1\right)$

$a_n=50\ -25\left(n-1\right)$

$a_n\ =\ 125\ +25\left(n-1\right)$

 $a_{n\ }=\ 125\ -25\left(1-n\right)$ 

 $a_n=84\ +\left(n-1\right)\left(16\right)$  

 $a_n=84+\left(n-1\right)\left(-16\right)$  

 $a_n=84-\left(n-1\right)\left(16\right)$  

 $a_n=84-\left(n-1\right)\left(-16\right)$  

 $a_n=84+\left(1-n\right)\left(16\right)$  

72

102

82

92

112

-0.94

0.06

-2.06

2.06

-3.06

d = 5

d = -15

d = -11.67

d = -70

d = -18.75

28

29

30

31

32

{ 4, 40, 400, 4000, 40000, ...}

{ 4, -6, -16, -26, -36, ...}

{ 10, 14, 18, 22, 26, ...}

{ 4, 14, 24, 34, 44, ...}

{ 10, 6, 2, -2, -6, ...}

-200

-158

-186

322

-172