List two situations or problems for which you have used a number line in the past

Thales was an ancient philosopher familiar with similar triangles. one story about him says that he found the height of a pyramid by measuring its shadow and his own shadow at the same time. if the person is 5-ft tall, what is the height of the pyramid in the drawing?

Complete the solution of the equation. find the value of y when x equals to 1 9x-5y=29

Does anyone know how to solve and graph this: 4 + | a + 2 | < 7the only part i don't get is the "4 +"