An internet advertiser gets revenue of R(x, y) million dollars for x hours of advertising during one week which is watched by y million people.

(a) Last week R(3,5)=2. What is the practical meaning of this?
(b) Ry(3,5)=0.3. What is the practical meaning of this?
(c) Rx(3,5)=0.2. What is the practical meaning of this?
(d) Suppose the number of people watching this week will drop by one million. How many extra hours of advertising are necessary to achieve the same revenue as last week? hours

(a) Practical meaning of R(3, 5) =2 is that For every 3 hours of advertising during 1 week which was spectated by 5 million peoples the advertiser gets a revenue of 2 million dollars .

(b) Practical meaning of Ry(3, 5) =0.3 is that For every increase of 1 million people in the number of people spectating the advertisement for 3 hours of advertising during the week the revenue of advertiser  will get increased by 0.3 million.

(C) Practical meaning of Rx(3, 5) = 0.2 is that the for an increase of every advertising hour during one week when the advertisement is spectated by 5 million peoples. revenue of advertiser will get increased by 0.2 million dollars

(d) If the number of peoples watching this week gets drop by one million then the number of extra hours of advertising necessary to acheive the same revenue as the last week will be given by the ratio of Ry(3, 5) and Rx(3, 5)

Hence the extra hours of advertising necessar to achieve the same level as the last week will be 1.5 hours.

the correct answer is 5 6 and 7

answer: c, the green line

step-by-step explanation:

there is no black line, eliminate b.

simple interest implies periodic payments, but the red line shows no payments, eliminate d.

simple interest has equal payments. if paid say every day, the graph is about a straight line (actually a stairstep).

the yellow line is not straight, eliminate a.

check: the green line is straight, answer is c.

simple interest with positive interest rate gives a straight line sloping up to the right. green line:

g(t) = $100 + ($200-$100) ÷ (20 years) × (t years)

= $100 + (4%/year) × ($100)(t years)

incidentally, the yellow line curving upward represents continuously compounded interest

y = $100 × 2^(t years / (14 assuming the yellow line hits $200 at 14 years. 2^0 is 1, so y(0) = $100; 2^(14/14) is 2, so y(14) = $200.