The angle has to equal 90 degrees, so write the equation: (7x + 6) = 90. Subtract 6 from both sides to get: 7x = 84. Simplify by dividing 7 from both sides to get x = 12.
The answer is D. because if there is 32 total, and 18 of them are girls, that means that there are 14 boys . with the question asking for girl/boy ratio it would have to be 18/14 in that order . if you divide 18 and 14 by two, they simple down to 9/7 . making the answer D.
157 degrees ... set 4x-5 = x+16 then solve, you should get x=7, plug in 7 for one of the equations and you'll get 23. subtract 23 from 180 and get 157. hope that helped :)
