Jessica has an account with a credit union. her account earns 2.2% simple interest yearly. exactly a year and a half ago, she opened her account with $900. how much interest has she earned so far? a. $29.70 b. $2,970.00 c. $39.60 d. $23.76

$29.70

Step-by-step explanation:

when she opened her account she opened it with $900.00 she will get 2.2% interest per year.  she leaves it for 1 1/2 years.  what you do it you multiply 900.00 x 2.2%    that will give you $19.80 then you have to divide it by 2 and that will give you 9.90.  then you add 9.90 + 19.80 = 29.70

900. x 2.2% = 19.80

19.80 divide by 2 = 9.90

9.90 + 19.80 $ 29.70

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a