by angle sum property in traingle having
,
$50+70+x=180 \implies x=60^{\circ}$
now, by exterior angle property of triangle, $x+y=60+50$
put $x=60$ to get $y=50$
I’m not positive but I think you would go 9x9x4 because it could be 1-9 for the first and third and 2,4,6 or 8 for the second
Accuracy is how close a measured value is to the actual (true) value.
150 mililiters equals to about 5.07 ounes