Guys i'm 14 and i suck at explaining so just bear with me: a thought just poped in my mind while i was watching a timer. is time even measured correctly? how does 0 seconds suddenly appear as 1? there are infinite numbers that it takes to go to one, like 0.4 to 0.878230640236408103147 and so on. shouldn't that take longer? 0 should never reach 1 am i right? my brain is just going all over the place plz me

Ithink is b. or c.

You need to figure out at which x-value does the graph has a tangent line slope of -1.remember, the derivative is the slope of the tangent line. so find the derivative function and set it to equal -1 to find the x-value that will have a tangent line slope of 0.differentiate with the chain rule.    set the derivative to equal -1 and solve for x.      take log base 10 of both sides. also recall that  .    so the x-coord of the point of tangency is .the y-coordinate of this point of tangency can be calculated using the original function:     using point-slope form, the equation of the tangent line is      the x-intercept of this tangent line is when the graph is at y=0.    this rounds off to  .choice c.