That depends on who they are and why their answers should matter as opposed to other peoples' answers.
0x10=10 because your counting 10 0 times
10 x 10 x 10 x 10 x10 x 10 x 10 =10,000,000
29000000
No, since there's no decimal point, it equals 875 or 8.75 x 10^2
4.5 x 108 = 450,000,000
100
x5 times x10 equals x50. This is because when you multiply variables with the same base, you add their exponents (5 + 10 = 15), resulting in x^(5+10) = x^15.
There are infinitely many possible answers. One such is 170/10
There are infinitely many answers. One such is: 22130/10 = 2213
There are infinitely many possible answers. One such is 10*6.4 another possible ans. 8x8=64
There are infinitely many possible answers. Two such are 1*46 and 10*4.6
There are infinitely many answers. Two possibilities are 10*31.5 and -1 * -315