Hellp

what's the missing number? 7/16 = ?/64

a) 4
b) 21
c) 28
d) 55

Ammonia molecules have three hydrogen atoms and one nitrogen atom. how many of each atom arein five molecules of ammonia

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

Which of the following correctly justifies statement four of the two column proof? a. corresponding angles theorem b. transitive property of equality c. vertical angle theorem d. substitution property of equality