Answer:-288
Step-by-step explanation:
Given
First term
is common for both AP and GP
For AP
---1
----2
From 1 & 2 we get
d=4

for AP

For GP
----3
----4
From 3 & 4 we get



For 

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(2x+5)(6x-1)=120
2x(6x-1)+5(6x-1)=120
12x^2-2x+30x-5=120
12x^2+28x-5-120=0
12x^2+28x-125=0
Find the roots of the equation by quadratic formula
Add three to both sides: 4|8n+10|=56
divide by 4: |8n+10|=14
so 8n+10 could be 14 or -14
if it's 14, n=0.5
if it's -14, n=-3.5
3x+1=1 because it is a hard problem to solve just ask your teacher
A. It will slow down and eventually stop.