- Sin^2(theta)=2 cos(theta)+2?

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Could someone help me with these math problems? I can't figure them out. Solve the linear equation;
x+2y=15
y=-2x+0 9x-12y=-3
-12x+16y=4? White light is directed at difraction grating at angle normal to gratting.starting at norml to grating 0dgre the odr of red,gren,blue wil be? Discrete Help ASAP. Please write out symbolic notation.? Find the complement of the angle 3pi/7. Please show steps!? When the pressure that a gas exerts on a sealed container changes from -atm to 1.80 atm, the temperature changes from 86.0 C to 30.0 C.?