Find the interest on $4,000 at 3% for 4 months

Will mark brainliest question in the pic.

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Marco has $38.43 dollars in his checking account. his checking account is linked to his amazon music account so he can buy music. the songs he purchases cost $1.29. part 1: write an expression to describe the amount of money in his checking account in relationship to the number of songs he purchases. part 2: describe what the variable represents in this situation.