Someone help me with these please

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

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points