Can somebody help me ASAP plsss ?

Which of the following is the equation that says that the product of a number and ten is equal to 20 percent of that number ? a) 10n= 2.0n b) 10+n=.20n c) n+ .20n=10 d) 10n=0.20n

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?