C: 2,6 and d: 0,26 i hope it helped :)
When using both negative symbols, and then multiplying them, this would mean that the numbers would be going up.
A negative (x's) a negative equals a positive.
Your answer: positive.
X=420. You can find this by cross multiplying.
Given a sequence; a₁,a₂,a₃...,an,
The common difference is d= a₂-a₁=a₃-a₂=a₄-a₃....
In this case:
a₁=1.05
a₂=1.1
d=a₂-a₁=(1.1)-(1.05)=0.05
Answer: The common difference is 0.05.
