Select all of the following that are a direct variation.

songs are 99 cents each to download.
tickets for rides at the fair are $1 each.
arcade games are 50 cents or $1.
to go tubing it is $5 to rent the tube and $7 for each hour.

The following are the direct variations:

Songs are 99 cents each to download.

Tickets for rides at the fair are $1 each.

I am hoping that these answers have satisfied your queries and it will be able to help you.

alot

step-by-step explanation:

its a wood chuck that can chuck wood

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this