Aye can some1 plz help me with this 1 question!?!?

Find the greatest common factor of -30x 4 yz 3 and 75x 4 z 2.

The weight of an object in the water is 7% of its weight out of the water. what is the weight of a 652g object in the water?

Atest consists of 10 multiple choice questions, each with 5 possible answers, one of which is correct. to pass the test a student must get 60% or better on the test. if a student randomly guesses, what is the probability that the student will pass the test?