It looks like an incomplete equation.
3 x10 30 x10
Yes, if x10=y.
60 square feet.
One sequence could be -4, x10, -4, x10, ect.. So the sequence will be 10, 6, 60, 56, 560, 556, 5560, ect..
e could either mean x10^ or 2.718. I think in this case it means x10^. THIS ANSWER WILL REQUIRE AN UPDATE.
29000000
No, since there's no decimal point, it equals 875 or 8.75 x 10^2
60 square feet
0x10=10 because your counting 10 0 times
60 equals seconds in a minute
That depends on who they are and why their answers should matter as opposed to other peoples' answers.
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.