R’(-1, 9) is the image of R after a reflection in the x-axis. What are the coordinates of R?

Step-by-step explanation:

When we reflect over x-axis then the x-coordinate doesn't change and the y-coordinate changes its sign

in means  if R = (x, y) then R' = (x, -y)

so we have:

x = -1    and      -y = 9

                        y = -9

which gives R = (-1, -9)

282 6/7 cm^2

step-by-step explanation:

(a) the volume of the cone is 20/3 in3

hence, option a is correct.