math_celebrity Administrator Staff member Sep 30, 2021 #1 $45 and you add $2.25 each day Let d be the number of days. Our Cost function C(d) is: C(d) = 2.25d + 45
$45 and you add $2.25 each day Let d be the number of days. Our Cost function C(d) is: C(d) = 2.25d + 45