The opposite angle is also 80°. since consecutive angles must total 180, the other 2 angles are 100 each. 100+100+80+80=360, as needed for a parallelogram
You just need to plug the values: you have to multiply 
and 
, and then divide the result by -3.
So, if 
, we have 
Which means that 
And the final answer is 
I'm pretty sure the answer to your question would be A
The dogs weight in kilograms is 13.5. Take the nine and divide it by 20, then multiply the 30 into that number.
