Can someone me learn linear equations

Suppose the radius of a circle is 16. what issuppose the radius of a circle is 16. what is its circumference its circumference

Listed in the table is the percentage of students who chose each kind of juice at lunchtime. use the table to determine the measure of the central angle you would draw to represent orange juice in a circle graph

The length of a rectangle plus its width is 25 cm. the area is 156 square cm. what are the length and width of the rectangle? separate the answers with a comma.