Answer:
an = 2.5n -0.2
Step-by-step explanation:
an = 2.5n -0.2
21.5.......:::..............:.::.::..
For this case we have the following expression:

Applying distributive property to the terms within parentheses taking into account that:

We have:

We add similar terms taking into account that:
Equal signs are added and the same sign is placed.

Thus, an equivalent expression is:

Answer:

Answer:
2 significants choes the least significant digets which is 19.35
result is 221,267.25
I'm assuming this is a system of equations you want solved so,
x = -y + 3
-2(-y+3)+4y = 6
2y - 6 + 4y = 6
6y = 12
y = 2
x + 2 = 3
x = -1
(-1,2)