What three distinct numbers a, b,c satisfy that f(a) = f(b) = f(c)?

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The cost of a concert ticket last week was $60 this week a concert ticket is $75 what is the percent increase of the ticket from last week to this week

Given that p = (-7, 16) and q = (-8, 7), find the component form and magnitude of vector qp--> . (options below, will mark )