Which number is the constant of proportionality
x|y
3|7 1/2
5|12 1/2

answer: they are supplementary angles

step-by-step explanation: 161+19=180. supplementary angles equal 180 degrees

the answer is  

c.

90.0π cm^2

hope you got it.

x=-2

step-by-step explanation:

i began by flipping the problem to give me x= on the left (keeps it clearer for me).   so my problem simply became 10x-3=4x-6.  

1)   subtract 4x from the right side, which equals 0.   you do the same to the left of the equal as the right; therefore, subtract 4x from 10x, leaving 6x on the left.

              10x-3=4x-6   :   4x-4x on the right leaves only the -6        

2)             6x-3= 0-6 :    

                6x+3=   -6

3) divide