A student uses data to find the quadratic regression function h= -0.81t? + 19.93t,
which models an object's height, h, in
meters, t seconds after it is launched
upward from the surface of the moon.
Which is the best estimate of the
height of a rock 3.1 seconds after it is
launched?

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value

where are the images of the functions i can only see the question you typed.

step-by-step explanation:

the answer would be d.

step-by-step explanation:

move all variables to the left side and all constants to the right side

(x−3)^2+(y−1)^2=16

this is the form of a circle. use this form to determine the center and radius of the circle.

( x − h ) 2 + ( y − k ) 2 = r 2

match the values in this circle to those of the standard form. the variable   r   represents the radius of the circle,   h   represents the x-offset from the origin, and   k   represents the y-offset from origin.

r = 4

h = 3

k = 1

the center of the circle is found at   ( h , k ) .

center:   ( 3 , 1 )

these values represent the important values for graphing and analyzing a circle.

center:   ( 3 , 1 ).

radius:   4