What is the justification for step 3 in the solution process? 0.8a − 0.1a = a − 2.5 Step 1: 0.7a = a − 2.5 Step 2: -0.3a = -2.5 Step 3: a = 8.3 A. the addition property of equality B. the subtraction property of equality C. the division property of equality D. combining like terms

answer: 4  

the square root of 16 is 4. it is a very simple mathematic concept. a square root when a number multiplied by itself will result in a number. here, the number 16 comes when 4 is multiplied by 4. hence the square root of 16 is 4. you can always figure out a square root by the inverse operation of squaring.  

hello,

as   long as they add up to 180 its correct.