Make up a time when someone would make a deposit, withdrawal, or transfer. Then say what you would do in your account. Examples:

-If I earned $15 babysitting, I would deposit (or add) $15 to the previous balance.
-If I bought a new sweatshirt for $42.66, I would withdraw (or subtract) $42.66 from the previous balance.
-If transferred $100, I would subtract $100 from the account it is leaving and add $100 to the account it is going to.

answer:

it is general formula that is used to write value to its excet position

a11 a12 a13

a21 a22 a23

it is the example of order 2 by 3 matrix in this

a11 means value occur in 1 st row 1st column

a12 means value occurs in 1st row 2nd column

a13 means value occur in 1st row and 3rd column

a21 means value occurs in 2nd row and 1st column

a22 means value occurs in 2nd row and in 2nd column

a23 means value occurs in 2nd row and in 3rd column

the answer is b