8,16,24,32,40,48,56,64,72,80,88,96,104,112,120,128,136,144,152,160,168,176,184,192,200,208,216,224,232,240,248,256,264,272,280,288,296,304,312,320,328,336,344,352,360,368,376,384,392 and so on are all multiples of 8 because 8 times a number=those two multiplied is one of those answers. Hope this helps.
Answer: 5 s
Step-by-step explanation:
Given
Height of the rocket can be modelled as 
Rocket will land on earth when it's height becomes 0

Neglecting 0 value
Thus, rocket remains in air for 5 s.
Use my photo to see the work and answers! Hope this helped :)
24000(total books) / 3000(batch of books with amount of errors known) = 8
8*3 = 24,
8*4 = 32
There will be between 24 and 32 printing errors.