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.

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.

according to this law, when unemployment goes up by 1%, gdp drops by 2%. in the question, unemployment rate goes from 2% to 5%, meaning unemployment goes up by 3%, so the gdp drops by 6%. thus the effect is a drop in gdp by 6%.

step-by-step explanation: