The total cost of four pens and seven mechanical pencils is $9.73. the cost of each mechanical pencil is 0.75 cents. which represents the cost of each pen?
(a) $0.75
(b) $1.00
(c) $1.12
(d) $1.30

Is there a direction u in which the rate of change of f(x,y)equals=x squared minus 3 xy plus 4 y squaredx2−3xy+4y2 at p(1,2) equals 14? give reasons for your answer. choose the correct answer below. a. no. the given rate of change is smaller than the minimum rate of change. b. no. the given rate of change is larger than the maximum rate of change. c. yes. the given rate of change is larger than the minimum rate of change and smaller than the maximum rate of change.