Will give

a rectangular solid is dilated by a factor of 0.5.

how many times larger is the volume of the resulting solid than the volume of the original solid?

answer:

29) discriminant   is positive

30) discriminant   is 0

31) discriminant   is negative

step-by-step explanation:

the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.

in the graph of question number 29 we can see that the graph intersects the x axis at two points

so the equation has 2 solutions.

when the equation has two solution then the discriminant is positive

in the graph of question number 30 we can see that the graph intersects the x axis at only one point

so the equation has only   1 solution.

when the equation has only one solution then the discriminant is equal to 0

in the graph of question number 30 we can see that the graph does not intersects the x axis  

so the equation has 2 imaginary solutions.

when the equation has two imaginary solutions then the discriminant is negative

answer:

18 miles

step-by-step explanation:

let's call it's initial elevation x. because it descends 3 miles, we now have x - 3. the question says it is now 15 miles above sea level, or x - 3 = 15, and adding 3 to both sides shows that x = 18 miles.