3 years ago

Someone help and solve for X

Mathematics

1 answer:

IgorC [24]3 years ago

7 0

Step-by-step explanation:

since all angles add up to 180:

(8x-1)+(3x+4)+(3x+9)=180

add like terms:

14x+12=180

x=12

Hope that helps :)

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Consider the 3 × 3 matrix A =   0 1 k 2 k −6 2 7 4  . For what values of k is matrix A invertible? (a) k ∈ R (b) all real k

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A is invertible if and only if det(A)≠0. Let's compute the determinant of A and find the values k for which it is nonzero.

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