- Find all solutions to the equation 8cos(x+3)=1 in the interval 0≤x≤2π.?

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If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? Solve the equation for x.
e^x = 85? Diameter of a wheel 80cm. If the wheel rotates through an angle of 200degrees, how many cm does it move? Show steps please!? 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?