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4x-9+x-1=180    => Same side interior angles are supplementary

5x-10=180          => Add like terms

5x= 190           => Addition Property of equality

x= 38

Substitute:

m<A=4x-9

m<A=4*38-9

m<A=143

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here you hope this .

step-by-step explanation:

hypotenuse = √(15² + 8²)

=  √(225 +64)

=  √(289) = 17

sin(x) = cos(y) = 8/17

they are identical so long as you are doing the sine of one angle and the cosine of the only other angle that isn't the right angle.