- Write the 1st trig function in terms of the second trig function. cot x ; csc x?

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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? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? How many milliliters of concentrated of sulfuric acid (18 M) are required to make 7.0 L of 0.12M H2SO4? 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.? Describe how and where new crust material is made. Describe how and where old crust is destroyed.?