Plz help last question plz it will mean a lot I’ll give brainliest

6.(q^9)^2 a. 2q^18 b. q^18 c. q^81 d.q^11 7.(6q^6)^-4 a. 6q^1296 b. 1296q^2 c. 1/1296q^24 d. 6q^-24 8. what is the value of 12x^-3 y^-1 for x = -1 and y = 5? a. -12/5 b.-10 c.-0 d.5/12

What is the value of x? enter your answer in the box. (cm)

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