In a quadrilateral the interior angles add up to 360 degrees so if you subtract 90, 53, and 74 from 360 you get the fourth angle
360-90-53-74 = 143
D. 143
2/3 Hass to be the answer because the larger number nine would be on top as the numerator. Therefore, I know this without even having to simplify. Hope this helps :-)
Y=3x+2 i believe is the answer
Let's call airplanes "a" and helicopters "h".
The total number of models is 35. This means that a+h=35
4 times as many model airplanes as model helicopters. This means a=4h.
we can substitute this into the previous equation:
4h+h=35
5h=35
dividing by 5:
h=7
so he has 7 helicopters and 4*7=28 airplanes
