What brought an end to the "normal state of hostility" between the Safavids and Ottomans mentioned in the passage? A. Safavid fervor for its brand of Islam slowly declined until the two empires stopped fighting.
B. The constant fighting increased the respect of the empires for each other, which eventually led to peace between them.
C. Both sides united to fight against European Christian forces that threatened them.
D. The Ottomans slowly weakened until the Safavids no longer saw them as a threat.

You this is right

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.