Simplify each expression using order of operations to reveal a fact about Earth Day. Earth Day is observed in this many countries... 6 + 2 18 + 200 – 8 x 10 2 e е​

-14

step-by-step explanation:

2x2 – 2(x+4)

=2x2-2（5+4）

=4-2×9

=4-18

=-14

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol

solve systems of equations by graphing. a system of linear equations contains two or more equations e.g. y=0.5x+2 and y=x-2. the solution of such a system is the ordered pair that is a solution to both equations. to solve a system of linear equations graphically we graph both equations in the same coordinate system