Which quadratic function opens down and has a vertex with a negative y value?
a. f(x)= 5x^2-18
b. g(x)= -4x^2+7x+20
c. h(x)= -1/2(x-9)^2+1
d. j(x)= -10(x+6)^2 -3

It's D.

Step-by-step explanation:

The function with a negative coefficient of x^2 will open downwards so its either B, C or D. The y value of the vertex is the last constant.

So the answer is D  with negative y value -3.

for the first question it would be the second answer for the second question it would be the third answer and for the third question it would be the first answer

step-by-step explanation: