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The DOT form MCS-150 must be filled out in order for a business to be assigned a USDOT number. The only person who can sign the MCS-150 form is the owner or sole prioprietor of the business that is applying for the DOT number.
sign function is math matrix function
If you mean in Excel, yes: you must always start a formula with an equal sign.
it depends to the value of the number,when the greater value caries the positive sign,your answer must be positive,when it carries the negative sign,your answer is negative.
That depends how you plan to solve it - there are several methods. But usually you would start by arranging the equation in "standard form", meaning that on the right of the equal sign, you only have zero.