2) Which of the following quadratic functions opens down?
A) y = x2 - 6x + 3
B) y=-4x2 + 9
C) y = 0.5x? – 9x + 6
D) y= 16x2 + 14x +9

d is correct

step-by-step explanation:

b. 1.25 hr

step-by-step explanation:

if you have a constant speed of 60 mph, then you have a ratio between 60 mi. to 1 hr. dividing both sides by 60 we get the ratio

1 mi. to

then mult. both sides by 75 we get the ratio

75 mi. to

simplifying we get

75 mi. to

or 1.25 hr.

b

step-by-step explanation: