The point ( 3,0) lies on a circle with the center at the origin. what is the area of the circle to the nearest hundreth

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 +"