It can help you by showing you what you do more simplified. For example 3(x+5) is 3 time x + 3 times 5
Step-by-step explanation:
I uploaded the answer to the file hosting:
B is true because 0-(-x) = 0 + x = x
1) an = a1 + d*(n-1) => a20 = -4 + (-9)*19 = -4 - 171 = - 175
1) ---> C)
2) a81 = 20 + 4*80 = 340;
2) ---> A)
3) a12 = ?
3) ---> B) or D).
The answer is 3 for sure.
