Ajeweler working with a heated 47 g gold ring must lower the ring's temperature to make it safe to handle. if the ring is initially at 99ºc, what mass of water at 25ºc is needed to lower the ring's temperature to 38ºc? 5.9 g 3.7 g 2.2 g 6.8 g

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length