Can someone help me answer part b please .As I have no idea what it is ?

The coordinates of B is (4,1)

Step-by-step explanation:

You can use the formula of mid-point. It is given that the midpoint of AB is (4,5). So you have to substitute the coordinates of A into the formula :

Let M be (4,5),

Let (x1,y1) be A(4,9),

Let (x2,y2) be B coordinates,

Then you could solve it :

answer:  

step-by-step explanation:

here x represents the height of the pole,

and, the height of the shadow of the pole is 12 feet.

also, the angle of elevation from the top of the pole is 40°,

therefore,

by the low of sine,

which is the required equation for finding the value of x,

9987

step-by-step explanation: