Does this have Infinite, No, or One solutions? 9x - 17 = -17 + 9x

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.

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

What is the point slope form of a line with slope -5 that contains point (2,-1)