HARD!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Subtract 3 from both sides
-12u = 8v + 1 - 3
Simplify 8v + 1 - 3 to 8v - 2
-12u = 8v - 2
Divide both sides by -12
u = - 8v - 2/12
Factor out the common term 2
u = - 2(4v - 1)/12
Simplify 2(4v - 1)/12 to 4v - 1/6
u = - 4v - 1/6
Answer:
Given the statement: For a person standing 100 m from the center of the base of the excel tower, the angle of elevation to the top of the tower is 71.6 degrees.
Let h be the height of the Eiffel tower.
Angle of elevation is, 
Distance of boy standing from the center of the base of the Eiffel tower is, 100 m.
Using tangent ratio:

From the given figure as shown;
Solve for h;

Multiply both sides by 100 we have;

or

Simplify:

therefore, the height of the Eiffel tower is, 300m
1, 2, 7, and 14. 2 and 7 are prime numbers.