book Maths Puzzle Numerical Ability

One more.
I am supposed to multiply and write as a polynomial in standard form: (2x+1)(x^3-x+2). I came up with 2x^4+1x^3-2x^2+3x+2. My question is how to put it into standard form?

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book Other Question

write the equation in standard form:

(2-3x)/y = 5

This is what I came up with:

y = 5(2-3x)

y = 10 - 15x

Any help would be great. Thank you! The formula A=2h(l+w) gives the lateral area A of a rectangle solid with length l, width w, and height h.

Q. Solve this formula for h.