A person invested 3200 in an account growing at a rate along with the money to double every 11 years. How much money would be in the account after four years to the nearest dollar

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

1- what do you think the product of a nonzero rational number and an irrational number is? is it rational or irrational? make use of variables, the closure property of integers, and possibly a proof by contradiction to prove your hypothesis.2- why do we have to specify that the rational number must be nonzero when we determine what the product of a nonzero rational number and an irrational number is? if the rational number were 0, would it give us the same result we found in the first question?

What is the value of n in the equation -1/2(2n+4)+6=-9+4(2n+1)