The exchange rate from Singapore Dollar (SGD) to United States Dollar (USD) is 1 : 0.75. a)Determine the exchange rate from USD to SGD. b)How many USD will you receive if you exchange SGD 3500? c)How many SGD will you receive in exchange for USD 6000?

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b