Question

help please
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1)The variable Z is directly proportional to X. When X is 10, Z has the value 190.
What is the value of Z when X = 13
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2)The variable Z is directly proportional to X. When X is 3, Z has the value 54.
What is the value of Z when X = 12
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3)The variable Z is inversely proportional to X. When X is 15, Z has the value 0.2.
What is the value of Z when X = 23

Answer 1

Answer for first is 1190

Answer 2

how did you get the answer

Answer 3

Z=X right?

Answer 4

im not sure how do problems