Question

9¹+9²+9³+9⁴.....+9ⁿ​

Answer 1

Answer:

9^1+9^2+9^3.........9^n

9(1+9+9^2+9^3...9^n)

9{a(r^n-1)/(r-1)}

9{1(9^n-1)/9-1}

9(9^n-1)/8

Answer 2

Answer:

3+3+3+3+5-3

Step-by-step explanation:

6+3+3 12-5 ,7