To specify the subspace spanned by three vectors, one can first form a matrix with the three vectors as its columns. Then, perform row reduction to obtain the reduced row-echelon form of the matrix. The non-zero rows of the reduced row-echelon form correspond to a basis for the subspace spanned by the three vectors. Finally, the subspace spanned by the three vectors can be specified by writing the basis vectors as a linear combination. **

An affine subspace is a subset of a vector space that is obtained by translating a subspace by a fixed vector. It is a flat geometric object that does not necessarily pass through the origin. On the other hand, a spanned subspace is a subspace that is formed by taking linear combinations of a set of vectors. It is the smallest subspace that contains all the vectors in the set. **

The parameter equation of the plane E spanned by the lines G and H can be expressed as: E: r = a + s * (b - a) + t * (c - a) where r is a point on the plane, a is a point on the plane, and b and c are points on the lines G and H, respectively. The parameters s and t are real numbers. This equation represents all the points on the plane E that can be reached by taking linear combinations of the direction vectors of the lines G and H. **

To determine the orthogonal complement of the vector space spanned by the vectors (0, 1, 2), you first need to find a basis for the subspace spanned by these vectors. In this case, the vectors (0, 1, 2) already form a basis for the subspace. Next, you can find the orthogonal complement by finding vectors that are orthogonal to all vectors in the subspace. In this case, any vector of the form (a, b, c) where a, b, and c are not all zero and satisfy the equation a*0 + b*1 + c*2 = 0 will be orthogonal to the subspace spanned by (0, 1, 2). **

Western riding apparel refers to the clothing and gear worn by riders who participate in western-style horseback riding. This typically includes a cowboy hat, long-sleeved shirt, jeans, cowboy boots, and a belt with a western-style buckle. Additionally, riders may wear chaps, spurs, and gloves for added protection and functionality. The apparel is designed to be comfortable, durable, and practical for the demands of western riding disciplines such as trail riding, ranch work, and rodeo events. **

Western riding apparel refers to the clothing and accessories worn by riders in Western-style horseback riding. This typically includes a cowboy hat, long-sleeved shirt, jeans, cowboy boots, and a belt with a buckle. Western riding apparel is designed to be practical and comfortable for the rider while also reflecting the traditional Western cowboy aesthetic. Additionally, riders may also wear chaps, spurs, and gloves as part of their Western riding attire. **

Footwear refers to any type of garment worn on the feet, such as shoes, sandals, boots, and slippers. It is designed to provide protection and comfort for the feet while also serving as a fashion statement. Footwear comes in a variety of styles, materials, and designs to suit different activities and occasions. It plays a crucial role in supporting the feet and promoting overall foot health. **

Sturdy footwear refers to shoes or boots that are strong, durable, and provide good support and protection for the feet. This type of footwear is often made from high-quality materials such as leather, rubber, or synthetic materials, and is designed to withstand rough or challenging conditions. Sturdy footwear is commonly worn in outdoor activities such as hiking, camping, or construction work, as well as in situations where extra stability and protection for the feet are needed. **