Answer:
a = 2 , r = 5
Step-by-step explanation:
The n th term of a geometric progression is
= a![r^{n-1}](https://tex.z-dn.net/?f=r%5E%7Bn-1%7D)
where a is the first term and r the common ratio
Given the 4 th term is 250, then
ar³ = 250 → (1)
Given the 7 th term is 31250, then
a
= 31250 → (2)
Dividing the 2 equations gives
=
, that is
r³ = 125 ← take the cube root of both sides
r =
= 5
Substitute r = 5 into (1)
a × 5³ = 250, that is
125a = 250 ( divide both sides by 125 )
a = 2
Answer:
y= mx+ c is the linear equation for y= 2 x+1
Also I think the answer is 55
Answer:
$3
Step-by-step explanation:
at $2 each 9 bars would be $18
at 3/$5, 9 bars would be $15
because 9bars /3bars per set=3 sets & 3 sets of 3 at $5 is $15