You must obey any direction, order, or signal made by a police officer or firefighter,

a. even if it conflicts with existing signs, signals, or laws

b. even if it is unsafe to do so

c. unless it conflicts with existing signs, signals, or laws

d. unless you are in a truck weighing more than 26,000 lbs

Yes, you can get ap exam prep books that correspond to the exam you will be taking. i honestly think the ap biology exam was one of the easier exams to take.

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.