HEYO HOW DO I GET YOUR GUY’S ATTENTION TO ANSWER MY QUESTIONS! I HAVE SOME QUESTIONS:

NUMBER 1: Why do you solve for a specific variable?
NUMBER 2: Why would you want to solve for a specific variable variable?
NUMBER 3: Show an example of solving for a specific variable.

(I posted this same question like 4 times lol)
PLEASE ANSWER

You and three friends will be going out to eat at your favorite restaurant! each of you will order three items of your choice. you will also need to leave a tip. if you split the bill evenly among all four of you, how much will each person need to contribute? locate a menu for your favorite restaurant and pick three items for yourself and each friend. list the restaurant name, items, and prices in a table like the one below. in the column labeled subtotal, determine the cost of each person’s order. the customary tip is 20% of the total bill. in the column labeled tip, calculate the amount of tip each person should leave. in the column labeled total bill, determine the total of each person’s order, including the tip. restaurant name: names item 1 price item 2 price item 3 price subtotal tip total bill your name friend #1 friend #2 friend #3 part 2: questions answer the following questions, showing all work: what is the total cost of the entire bill (all four meals), including tip? write an expression using fractions to show how to determine the amount that each person will pay. then calculate each person's contributions showing all steps in long division. if each person paid an equal amount, who would save the most money? explain your reasoning using at least two complete sentences.

For each proportion find the unknown number x 1/5/8=×/15

If i had 1234 apples and 1 banana what is the total amount