This document contains 4 programming problems: 1) Develop a program to calculate and print the value of y from an equation given an input value for x. 2) Create a program to input grades from 5 assessments, calculate the final average, and display all grades and the average. 3) Develop a program that converts an amount in soles to dollars given a dollar exchange rate input. 4) Design a program to purchase 2 items, calculate the 18% IGV tax, and display a sales receipt with the item details, prices, tax, and total.