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What is #\frac { 4} { 14}+ \frac { 1} { 7}#?

A 5 gram piece of aluminum foil at 100 degrees C is dropped into a 25 gram container of water at 20 degrees C. What is the final temperature of the aluminum?

In triangle ABC, <B is a right angle and m<A = 40. Given that AC = 15, what is AB to the nearest tenth?

Glass is prepared by hearing sand with limestone and washing soda
8. _SiO2(s) + _ CaCO3(s) CaSIO3(s) +Co2(g) ?
9. _ SiO2 (s) + _ Na2CO3(s) Na2SiO3 +_ CO2 (g) ?

Explain with a sketch:
a.Why the bottom of a glass filled with water appears closer?