What is the solution to this equation?

6(x - 3) = 3x + 9

a.
x = 3

b.
x = 9

c.
x = -3

d.
x = -1

Which number produces a rationale number when multiplied by 1/5

:24% of students in a class are girls. if there are less than 30 students in this class, how many students are there? how many girls are there?

Amotorboat maintained a constant speed of 12 miles per hour relative to the water in going 45 miles upstream and then returning. the total time for the trip was 8.0 hours. use this information to find the speed of the current.