Evaluate the expression when a=6 . a-24 ( a: -30 , b: -18 , c: 18 , d: 22 )

Mika taught her sister the steps for dividing a decimal by a decimal. which instructions are correct? 1. multiply the divisor by a multiple of 10 to create an integer divisor. 2. multiply the dividend by the same multiple of 10 as step 1. 3. divide, and apply the rules for dividing signed numbers. 1. multiply the dividend by a multiple of 10 to create an integer. 2. multiply the divisor by the same multiple of 10 as step 1. 3. divide, and apply the rules for dividing signed numbers. 1. divide the divisor by a multiple of 10 to create an integer divisor. 2. divide the dividend by the same multiple of 10 as step 1. 3. divide, and apply the rules for dividing signed numbers. 1. divide the dividend by a multiple of 10 to create an integer. 2. divide the divisor by the same multiple of 10 as step 1. 3. divide, and apply the rules for dividing signed numbers. huy