Answer:
2, last
Explanation:
1.
The divisibiliy by 9 rule is that if the sum of all digits is divisible by 9 then the number is divisible by 9.
? + 1 +2 +5 +8 = ? + 16
what number is
-greater then 16
-the closest to 16 and divisible by 9
18 so ? = 2 because 2+16 = 18
2 + 1 +2 +5 +8 = 18
18 is divisible by 2 so 21,258 is divisible by 9
2.
The factors of 60 are 1,2,3,4,5,6,10,12,15,20,30,60 because all of those numbers you can multiply by another and the answer will be 60.
1*60 = 60; 2*30 = 60; 3*20=60; 4*15= 60; 5*12= 60; 6*10=60.