Excel Formulas HELP!!!

I am reaching out for last minute help, please please.

I have an assignment due by midnight and need help with formulas.  Honestly I just don't know how to use them properly.  I've tried several times and get the Value error or something weird but no numbers are coming thru.  I thought i was entering these formulas correctly. 

Formula for:  Converting my budget into the currency for said country and convert the amount of units of the local currency into dollars. 

Formula for:  I need to use excel functions to find the slope and y-intercept of the best-fit line for the given coordinates.  Also need to calculate the avrg weekly income for all the years of edu using the slope and y-intercept to calculate.  What is BLS DATA as a scatterplot?

Formula for:  convert miligrams per milliliter to micrograms per teaspoon (this is just one out of 4 formulas that I need.