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Indicate which type of immunity is described in the each statement below. Each answer is used only once.

This old railway station sign from the early 1900s was intended to prevent transmission of which of the following diseases?

Simplify:          

What is the policy on make up tests?

Perform the indicated operation:      

Solve for x:         

If the dimension of is 3×5 and the dimension of is 3×5, then dimension of is [b1] x [b2]. If the dimension of is 3×4 and the dimension of is 4×3, then dimension of  is [ba1] x [ba2].

[a] If is reducible to the identity matrix, then is invertible. [c] The inverse of the inverse of an invertible matrix is the matrix itself. [d] If and , then  is singular.

Given the following matrix and vectors:

If the dimension of is 5×3 and the dimension of is 5×7, then dimension of is [b1] x [b2]. If the dimension of is 4×3 and the dimension of is 3×4, then dimension of  is [ba1] x [ba2].