How many 5-number license plates can be made using the digits 1, 2, 3, 4, 5, 6 if repetitions are not allowed, then even numbers?

What is the solution of log2  (3x  -  7)  =  3? 4 5

Icould really use some with this question.

Amodel rocket is launched from a roof into a large field. the path of the rocket can be modeled by the equation y = -0.04x^2 + 8.6x + 4.8, where x is the horizontal distance, in meters, from the starting point on the roof and y is the height, in meters, of the rocket above the ground. how far horizontally from its starting point will the rocket land? a. 0.56 m b. 215.56 m c. 431.11 m d. 215.74 m