Awhite dwarf, a dense dead star, burns through its hydrogen before it can grow into a supernova. identify the nonessential appositive phrase. a white dwarf a dense dead star hydrogen supernova

To me I think the answer is the phrase “a dense star”. Although it may sound silly, the phrase “a dwarf star” is relevant because it explains what it starts out as. “Hydrogen” is important because it describes how the change occurs. The phrase “supernova” explains what it turns into. All of these frases except for “a dense dead star”, the description of what a dwarf star is, are relavent to the passage.

Answerimmediately

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.