Determine how many lines of symmetry each object has. Then determine whether each object has rotational symmetry. A. 5; yes B. 5; no C. 4; yes D. 4; no

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.

the answer is "add 2y and y"

step-by-step explanation:

you need to collect the like terms first.

5: 20

step-by-step explanation: