Một cửa hàng bán 4 sản phẩm (sp) A, B, C, D. Tuần 1: Bán được 12 (sp A), 8 (sp B), 9 (sp C), 14 (sp D) tổng thu 10.400.000 đồng;
Tuần 2: Bán được 10 (sp A), 14 (sp B), 10 (sp C), 10 (sp D) tổng thu 11.600.000 đồng;
Tuần 3: Bán được 8 (sp A), 10 (sp B), 12 (sp C), 9 (sp D) tổng thu 9.900.000 đồng;
Tuần 4: Bán được 20 (sp A), 18 (sp B), 19 (sp C), 17 (sp D) tổng thu 10.400.000 đồng;
Cho biết: Tiền lãi (lợi nhuận) khi bán được một sp A là 15% / giá bán sản phẩm; tương tự sp B là 40%, sp C là 20%, sp D là 30%..
Tính tổng lợi nhuận của cửa hàng trong 4 tuần.

step-by-step explanation:

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

answer: okw

step-by-step explanation:

(0,-3) see attached graph

step-by-step explanation:

a. to solve the system, graph the two equations.

x = y+3 becomes y=x-3 has m=1/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move up 1 unit and 1 unit to the right. plot a point and connect.

y=-4x+3 has m =-4/1 and b=-3. start at (0,-3) on the y-axis and plot a point. then move down four units and to the right 1 unit. plot a point and connect.

the solution is the point (x,y) where the two lines intersect. by the graph below it is (0,-3).

b. to solve by substitution, substitute y = -4x-3 into x= y+3

x= (-4x-3) +3

x=-4x

5x=0

x=0

now substitute x = 0 back in to find y.

y= -4(0)-3

y=0-3

y=-3

solution is (0,-3)

c. use elimination by adding the equations together.

x-y=3

4x+y=-3

5x=0

x=0

then substitute into one equation to find y.

y=-4(0)-3

y=-3