Question

7. Point A has coordinates (-3, 11)
Point B has coordinates (47,b)
The midpoint of AB has coordinates (a, -19)
Find the value of a and the value of b.

Answer 1

Answer:

A line segment has endpoints (0,4) and (5,6). To find the midpoint, use the midpoint formula:

X: (x1+x2)/2 = (0+5)/2 = 2.5  

Y: (y1+y2)/2 = (4+6)/2 = 5

The coordinates of the midpoint are (2.5,5).

Answer 2

Answer:

An atmosphere is a layer of gas or layers of gases that envelope a planet, and is held in place by the gravity of the planetary body. A planet retains an atmosphere when the gravity is great and the temperature of the atmosphere is low.