X=7 because 7-3 = 4, 7+8= 15,15x4=60.
Answer:
The common difference is
or 0.2
Step-by-step explanation:
Given:
Arithmetic Sequence -2, -1 4/5, -1 3/5, -1 2/5,
First term = a₁ = -2
Second term = a₂ = 
Third term = a₃ = 
Fourth term = a₄ = 
To Find:
Common Difference = d = ?
Solution:
Formula for Common Difference d ,

∴ 
The common difference is
or 0.2
Answer:
$780
Step-by-step explanation:
15x60 = 900 900 - 120 = $780
Answer:
405
Step-by-step explanation:
Answer:

Step-by-step explanation:
We need to write
as a single logarithm.
We know that

Therefore we have:

→ 
→ 
The solution is: 