What is the equation in vertex form of a parabola with vertex (2,4) that opens downward and is stretched by a factor of 3?

Table which ratio is equivalent to 3: 7? 6: 7 3: 21 24: 56 15: 30

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?