At an aquarium, 6 out of 18 deliveries are plants. out of 15 deliveries in one week, how many are plants?

Can someone me and do the problem plz so i can understand it more better

The length of the line segment ac is 8x-9 what is the value of x

Which statement is true about the extreme value of the given quadratic equation? a. the equation has a maximum value with a y-coordinate of -21. b. the equation has a maximum value with a y-coordinate of -27. c. the equation has a minimum value with a y-coordinate of -21. d. the equation has a minimum value with a y-coordinate of -27.