Part A The poll report includes a table titled, “Americans Using Cash Now Versus Five Years Ago, by Age.” The age intervals are not equal. Why do you think the Gallup organization chose the age intervals of 23–34, 35–54, and 55+ to display these results?

If C is critical angle, then

sinC=

n

1

, where n is refractive index of the material.

Now, n =

2

, therefore ,

sinC=

2

1

Then, C =45

∘

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

the reason why your question keeps getting deleted because this is not a school related question : )

i will answer your question though.

i never tried church's