Which of the following best describes the diameter of a circle? 1. A segment whose endpoints are points on the circle.
2. A chord which passes the center of the circle.
3. A segment joining the center and any point on the circle.
4. A line that passes through the circle at exactly two points.

The average human heart beats 1.15 \cdot 10^51.15⋅10 5 1, point, 15, dot, 10, start superscript, 5, end superscript times per day. there are 3.65 \cdot 10^23.65⋅10 2 3, point, 65, dot, 10, start superscript, 2, end superscript days in one year.how many times does the heart beat in one year? write your answer in scientific notation, and round to one decimal place.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Proving the congruent supplements theorem