2. –80,20,–5,1.25
so basically what is happening is the numbers are each time being divided by –4
-80÷-4 (80/4 is 20) and since both both numbers are negative a negative divided by a negative is a positive which means the next answer will stay positive.
then 20÷–4 (a negative divided by a positive will stay negative) so 20/4 is 5 since one is negative it will end up –5... you see?
3. each time the number increases they're adding half their value to get the next number (or multiplying by 1.5) 4+2(half of four)=6
6+3(half of six)= 9 9+4.5(half of nine)=13.5
13.5+6.75(half of 13.5)= 20.25 etc...
4. each number is being multiplied by –2
-3*-2= 6, 6*-2=-12, -12*-2=24, 24*-2=-48...
