Sing a cofactor expansion across the first row. Also compute the determinant by a cofactor expansion down the second column. StartAbsoluteValue Start 3 By 3 Matrix 1st Row 1st Column 6 2nd Column negative 6 3rd Column 9 2nd Row 1st Column 9 2nd Column 3 3rd Column 6 3rd Row 1st Column 3 2nd Column 9 3rd Column negative 3 EndMatrix EndAbsoluteValueWrite the expression for the determinant using a cofactor expansion across the first row. Choose the correct answer below. A.Using this expansion, the determinant is (6)(negative 63)plus(negative 6)(negative 45)plus(9)(72).B. Using this expansion, the determinant is (6)(45)plus(negative 6)(99)plus(9)(90).C. Using this expansion, the determinant is (6)(negative 63)minus(negative 6)(negative 45)plus(9)(72).

4+n=5

step-by-step explanation:

this is because the four is four hours and the n represents the 1 extra hour over the weekend.

b= i'm srry i don't know that one.

4+n=5 n=1 because if vernon plays 5 hours a week then 4+1=5 hours.

hope this : )

proofs involving isosceles triangles often require special consideration because an isosceles triangle has several distinct properties that do not apply to normal triangles.(more about triangle types) therefore, when you are trying to prove that two triangles are congruent, and one or both triangles, are isosceles you have a few theorems that you can use to make your life easier.

step-by-step explanation:

an isosceles triangle has two congruent sides and two congruent angles. the congruent angles are called the base angles and the other angle is known as the vertex angle. ∠bac and ∠bca are the base angles of the triangle picture on the left. the vertex angle is ∠abc

the answer is 21%.

c. 6tan80

step-by-step explanation: