How might the graph be misleading

What is the value of 1/3× + 7x, when x =5

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Mr. thompson took five of his children to the bowling alley the cost for children 12 and older is 350 the cost of four children under 12 inch to 25 he spent a total of 1625 how many of his children are 12 and order