怎样用英语表述下列式子

1.x Multiplied by 5 ，result subtract 2 ，then absolute value of the result is equal to 9.

2.The sum of a series Sn is equal to One-sixth when the number of series n is near infinite.

3.Function f on x is a multiplied by the cubic of x plus b multiplied by the square of x plus c multiplied by x plus d(a is not equal to 0
,c is not equal to 0).

4.Function f on x is 5 plus the logarithm of the result of x subtract 7 to the base e.

5.The indefinite integral of the result of x multiplied by 2 subtract 3 with respect to x is equal to the square of x plus x multiplied by 3 plus a constant C.