Jane downloads album A. A has 11 tracks.
Each track on A costs the same.
The total cost of downloading A is £9.35
Jane also downloads album B and B has 14 tracks.
a) Work out the total cost in pounds (£) of downloading B.
Assume each track costs the same as a track on A.
(3)
+
b) In fact, compared to the cost of each track on A
the cost of 6 tracks on B is less by 7p each
the cost of 8 tracks on B is more by 7p each.
Work out the total cost in pounds (£) of downloading B.
(2)

Sketch the region enclosed by the given curves. decide whether to integrate with respect to x or y. draw a typical approximating rectangle and label its height and width. y= 5x, y=7x^2then find the area s of the region.

The table below shows the function f. determine the value of f(3) that will lead to an average rate of change of 19 over the interval [3, 5]. a. 32 b. -32 c. 25 d. -25

Exercise: counting committees 0.0/2.0 puntos (calificable) we start with a pool of n people. a chaired committee consists of k≥1 members, out of whom one member is designated as the chairperson. the expression k(nk) can be interpreted as the number of possible chaired committees with k members. this is because we have (nk) choices for the k members, and once the members are chosen, there are then k choices for the chairperson. thus, c=∑k=1nk(nk) is the total number of possible chaired committees of any size. find the value of c (as a function of n ) by thinking about a different way of forming a chaired committee: first choose the chairperson, then choose the other members of the committee. the answer is of the form c=(α+nβ)2γn+δ. what are the values of α , β , γ , and δ ?