What is the area of the trapezoid in the picture? I’m having trouble finding the length of top

Volume of cylinder with a radius of 8cm and height of 25 cm

Both the red and blue line segments stretch from the center of the circle to a point on the circle. the length of the blue segment is 5. how long is the red line segment?

Tim's phone service charges $23.06 plus an additional $0.22 for each text message sent per month. if tim's phone bill was $28.56, which equation could be used to find how many text messages, x, tim sent last month?