3.5903 and 28.4097 (to 4 dp).
-90
The numbers are: -0.4688 and -8.5312 to 4 decimal places More accurate values can be found by using the quadratic equation formula
-89
1,956 different numbers can be made from 6 digits. You can calculate this by using the permutation function in a summation function, like this: Σ6k=1 6Pk = 6P1+6P2+...+6P5+6P6 What this does is calculate how many 1 digit numbers you can make from 6 digits, then how many 2 digit numbers can be made from 6 digits and adds the amounts together, then calculates how many 3 digit numbers can be made and adds that on as well etc.
-5 and 3
25
Unfortunately there are no numbers that add to make 23 and multiply to make 50.25 + (-2) = 2325 x -2 = -50
41
25
-90
3
170
0
The numbers are: -0.4688 and -8.5312 to 4 decimal places More accurate values can be found by using the quadratic equation formula
164
135
There are no real numbers that will answer this question, just imaginary numbers. The imaginary numbers are 1+sqrt(-2) and 1-sqrt(-2), which we normally write as 1+2i and 1-2i where i stands for the sort of (-1) (1+2i) + (1-2i) =2 (1+2i) * (1-2i) = 3 (note * stands for multiply)