- What happens to a beam of light when it meets a perspex surface a) head on and b) at an angle?

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Last derivative problem please help? C4H8 + 6 O2 → 4 CO2 + 4 H2O If 197 grams of O2 react, how many grams of water form? How mean inches of rain to make a foot of show? Use the Cantor-Schröder-Bernstein Theorem to prove that [-1,1]~(-1,1)∪(1,2)? During a huge snowstorm in the White Mountains last year, it snowed 67.5cm in one day. How much did it snow in meters?