If the original pair of a pair of shoes is $80 but a sign above the shoes reads “ sale - 20% discount”, then what price would a customer pay for the shoes (excluding tax)?
a. 64
b. 80
c. 60
d. 16
e. 6

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

Anyone know? will mark brainliest if you're correct!

Ariana starts with 100 milligrams of a radioactive substance. the amount of the substance decreases by 20% each week for a number of weeks, w. the expression 100(1−0.2)w finds the amount of radioactive substance remaining after w weeks. which statement about this expression is true? a) it is the difference between the initial amount and the percent decrease. b) it is the difference between the initial amount and the decay factor after w weeks. c) it is the initial amount raised to the decay factor after w weeks. d) it is the product of the initial amount and the decay factor after w weeks.