Mary moneypenny went to her bank each week and opened a club account. she deposited $21.75 per time period. if she made 12 deposits before interest was credited, how much would she have deposited before interest was credited?

Lets see step by step,
she goes 12 times to the bank and made a deposit of $21.75 each time, therefore she have deposited:

deposit = 12*21.75 = $261

that is the amount she deposited before receiving any interest.

50 % is the answer !

Answer to your question: a. the fundamental theorem of algebra tells you that the equation will have two complex roots since the degree of the polynomial is 2. the roots are ​ x=1±i7√2 .number of roots=degree of polynomialhere, degree of polynomial is 2 so number of roots will be 2.hope it *_*