How does this get solved? i am a bit confused on what to do next. is very appreciated.

answer:

step-by-step explanation:

diagonals divide a regular hexagon into six equilateral triangles (look at the picture).

the formula of an area of an equilateral triangle with side a:

substitute a = 20 cm:

the area of a regular hexagon is equal six times the area of a triangle:

answer:

you went wrong on the 4th line   while expanding the parentheses.

see below.

step-by-step explanation:

(x^2 + 2x)(x^2 + 2x) - 4

= x^4 + 2x^3 + 2x^3 + 4x^2 - 4

= x^4 + 4x^3 + 4x^2 - 4. (answer).

answer:

third option:

domain: -∞< x< ∞, x≠π/2+nπ, where n is an integer

range: is -∞< y< ∞

step-by-step explanation:

the domain of the tangent function is:

-∞< x< ∞, x≠π/2+nπ, where n is an integer

the range is: -∞< y< ∞