Answer:
7x^2+2x-4
Step-by-step explanation:
a standard form is ax+by=c
5x^2 add 2x^2=7x^2 then -2x but when you have a -10 +6 you get -4 giving you the answer of 7x^2 +2x -4
Round all of the numbers to the nearest 10 then solve the problem like normal
Polygon A,B,C,D,E and polygon L,M,N.O.K
Answer:
add all the angles
Step-by-step explanation:
140+82+78
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