What is happening to this graph when the x-values are between - 1 and 1?

Which is an equation for the nth terms of the sequence 12,15,18,21

The radius of the circle is 4 cm and the measure of the central angle is 90° the area of the sector with a central angle measuring 90° and radius of length 4 cm is vt cm the triangle in the sector is 4 cm the area of the triangle is v/cm² the area of the segment of the circle is (471 - ) cm?

Measure of angles 31 (x+4) (3x+9) me