A certain long-distance carrier provides service between Podunk and Nowheresville. If x represents the number of minutes for the call, where x>0, then the function f defined by
f(x)=.40[[x]]+.75
gives the total cost of the call in dollars. Find the cost for a 5.5 min call.
2007-07-18 09:04:44 · 4 answers · asked by lildrehawk 1 in Science & Mathematics ➔ Mathematics
College Algebra
2007-07-18 09:12:14 · update #1
f(x)=.40[[x]]+.75
The greatest integer not greater than 5.5 is 5
f(5.5)=.40[[5.5]]+.75
f(5.5)=.40(5)+.75
f(5.5)=2.75
The cost for a 5.5 minute call is $2.75
2007-07-18 09:23:30 · answer #1 · answered by sdb deacon 6 · 0⤊ 0⤋
$9.70...if I understood the questions correctly...
2007-07-18 16:12:07 · answer #2 · answered by čŖåŻęĤ! 4 · 0⤊ 0⤋
[[5.5]] = 5
f(5.5) = 0.4*5 + 0.75 = $2.75
2007-07-18 16:25:05 · answer #3 · answered by Helmut 7 · 0⤊ 0⤋
what level math is this?
2007-07-18 16:09:02 · answer #4 · answered by Anonymous · 0⤊ 0⤋