Find the sum of the first 48 terms of the following series, to the nearest integer. 7,11,15

yes i do see that. i say this because i am doing my very best in high school so i can get a scholarship and credits.  

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

answer: given the scale 3,5 mm to 1 foot: so you know this and you need convert this 150mm to get the right answer.