Question

http://prntscr.com/6n5zc2

Answer 1

we are given the formula :
$$
\Large{
3\cdot 7^{n-1}
\\~\\
\text {plug in n=1,2,3}\\~\\
3\cdot 7^{1-1}, 3\cdot 7^{2-1}, 3\cdot 7^{3-1}

}
$$

Answer 2

21, 21^1

Answer 3

use order of operations when you simplify

Answer 4

so 21

Answer 5

are you looking at the third term?

Answer 6

yes

Answer 7

$$
\Large 3\cdot 7^{3-1} = \Large 3\cdot 7^{2} = 3\cdot 49

$$

Answer 8

49x3 is 147

Answer 9

correct.

Answer 10

how did u get 49 tho

Answer 11

$$
\Large{ 3\cdot 7^{3-1} \\
= 3\cdot 7^{2}
\\=3 \cdot 7 \cdot 7
\\= 3\cdot 49


}
$$

Answer 12

ok

Answer 13

so 21,49