amtrak's annual passenger revenue for the years 1980-2000 is modeled approx. by the formula, R=40|x+11|+900 where R is the annual revenue in Millions of dollars and x is the number of years since January 1, 1980 what years was the passenger revenue $790 millions

answer: it actually depends on which is the independent variable and which is the dependent variable. let us say we're looking at a linear equation. y=2x+3. we theoretically could switch the equation to be x=(y-3)/2 and it would be the same line. so either a causes b or it can be that b causes a. so technically the answer is false

step-by-step explanation:

i believe a. 12x≥120 is the answer

the linear relationship that represents a variation in direct proportion is the linear function that varies according to the numbers of its domain, for example the cost of producing x number of items can be represented in direct proportion by f (x) = mx + b, where m is the constant of proportionality, x the number of articles produced and b the fixed cost