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1. Round each of the following as specified:
a. 24.5791 to two decimal places b. 0.074639 to four decimal places c. -15.197 to two decimal places d. 32.64 to the nearest whole number
2. Calculate:
a. 18.64 ÷ 6.35 correct to 1 decimal place b. 50 ÷ 3 to the nearest whole number