Which best shows whether or not this is a reasonable answer, and why?

This is a reasonable answer because 20 – 5 + 1 = 16.
This is a reasonable answer because 20 – 5 + 2 = 17.
This is not a reasonable answer because 20 – 5 – 2 = 13.
This is not a reasonable answer because 20 – 10 – 2 = 8.

omg what happend to your question? if you could edit this question i can

step-by-step explanation:

arrange the equations with like terms in columns.

analyze the coefficients of x or y.

add the equations and solve for the remaining variable.

substitute the value into either equation and solve.

check the solution.

step-by-step explanation:

i think its a and d

step-by-step explanation:

step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.