Write an equivalent expression for the expression (a+b)(2+y)

2a+ay+2b+by

Step-by-step explanation:

(a+b)(2+y)

=(a+b)(2+y)

=(a)(2)+(a)(y)+(b)(2)+(b)(y)

=2a+ay+2b+by

=ay+by+2a+2b

hope it you

step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2

you estimate that the angle of elevation to the top of the 86th floor (the observatory) is 82 .the total height of the building is another 123 meters above the 86th floor.

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