Given data:
The expression of the first option is,
Thus, the above expression are not equivalent.
The expression in the second option is,
Thus, yes they are equivalent.
The expression in the third option is,
Thus, the above expression are not equivalent.
The expression in fourth option is,
Thus, yes the above expression is equivalent.
Answer:
85 cm
Step-by-step explanation:
the strut forms a right triangle with the end of the pole.
let the ends of the strut be x from the top of the pole . then
using Pythagoras' identity with 2 legs x and hypotenuse 1.2
x² + x² = 1.2²
2x² = 1.44 ( divide both sides by 2 )
x² = 0.72 ( take square root of both sides )
x = ≈ 0.85 m ( to 2 dec. places )
the ends are 0.85 m = 85 cm from the top of the pole