Is this direct variation x 3 4 5 6 y 2 3 4 5

Which point-slope form equation represents a line that passes through (3,-2) with a slope of -4/5

Whoever gets this right gets the ! the half life of a soul smelling substance is 4 years. if you have 8 oz of this strange substance, how much of it will you have after 20 years? show work.

The price of one share of a company’s stock declined $13.89 every day for 2.5 days what was the stocks total decline in price