How would i find x when there is a arrow pointing down instead of up

what does x equal to? ?

Type the correct answer in each box. spell all the words correctly, and use numerals instead of words for numbers. if necessary, use / for the fraction bar(s).

Why is x= 4 a solution to the proportion 14/x 56/1 6

The cost of a taxi ride includes an initial charge of $2.00. if a 5km ride cost $6.00 and a 10km ride cost $10.00, determine the cost of a 15km ride.