Question

Help me plz will fan and give medal!
Write the explicit formula for the geometric sequence. Then find the fifth term in
the sequence.
a^1 = −3, a^2 = 15, a^3 = −75
a. an = −3 ⋅ (−5)n ; 9375
c. an = −3 ⋅ (5)n ; –1875
b. an = −5 ⋅ (−3)n − 1 ; –405
d. an = −3 ⋅ (−5)n − 1 ; –1875

Answer 1

\[\huge\rm a_n = a_1 \times r^{n-1}\] equation to find nth term of geometric seq.
where a_1 is first term
r= ratio
n= term that u need

Answer 2

thank you

Answer 3

to find common ratio divide next term with the previous one
\[\large\rm r=\frac{ a_2 }{ a_1}~~or~~\frac{ a_3 }{ a_2} \]

Answer 4

a_2 = 2nd term
a_3 = 3rd term

Answer 5

r=-5

Answer 6

D @Nnesha

Answer 7

Am I right??

Answer 8

let me check wait a sec

Answer 9

ok

Answer 10

right

Answer 11

Yay!!

Answer 12

yahoo!