Answer:
{x + 4y = 8
{5x + 5y = 10
Step-by-step explanation:
Just add everything like it said, and you will arrive at your answer.
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Answer:
86
Step-by-step explanation:
if the order mattered it would be 7*6*5 *4*3 = 2520 arrangements
if order didn't matter
7*6*5*4*3*2 divided by (5*4*3*2*2) = 21
A triangle's angles add up to 180 degrees because one exterior angle is equal to the sum of the other two angles in the triangle. In other words, the other two angles in the triangle (the ones that add up to form the exterior angle) must combine with the third angle to make a 180 angle