- Please explain this problem for me.7 and 9 into 1 number equally?

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6. Find the general solution of each of the following nonhomogeneous differential equations: d^2x+ 4x = t^2 dt^2
d^2y − y = 2e^t dt^2? State de Moivre’s Formula and use it to find integers A and B such that cos 3θ = A cos3 θ + B cos θ.? Example 2. we are to find the degree of each term for 7? please expalin? A gas has a pressure of 17 atm. a vol of 96 L, & a temp of 284 K. If its initial pressure was 16 atm & initial vol was 84 L, initial temp is? What is meant by, "you are the salt of the earth, said by a neighbor?