May someone me find the second answer ? i already got the first i really need the second one

The one-time design fee is $8.======let c represent cost and x represent the number of business cards.the cost, c, is a function of the number of business cards, n.there is some one-time fee in the way; this would be the "y-intercept" portion.the slope would be the cost per card.so the form of this cost function is like a linear function of y = mx + b, excecpt with y = c and x = n:     c = m(n) + bwhere b is the one-time fee.the slope between (100, $13) and (500, $33) is    so we have    we know that when  (100 cards),  (final cost).  so we can substitute those values in and solve for b, the one-time fee.    therefore the one-time design fee is $8.======side note: full equation would be    which agrees with the given conditions. if you plug in n = 100, you'll get $13.if you plug in n = 500, you'll get $33.this will you on part c.

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.