Two different age groups were surveyed about the amount of time they spent on social media.
The results are shown in the two frequency
polygons below. The same time intervals were
used for both graphs.
11-year old students
15-year old students
80
80
70
70-
60
60-
50
a) How many 15-year old
students took part in
the survey?
(1)
b) How many more 15-year
old students than 11-year
old students spent
between 35 and 45 mins
on social media?
50
Frequency
Frequency
30-
30
20
20-
10
10
0
0
0 10 20 30 40 50 60 70 80
Time (mins)
10 20 30 40 50 60 70 80
Time (mins)
(1)
Total marks: 2​

yo answer should be 6 if im not mistaken

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

50*10 is greater

step-by-step explanation:

if you add the zero from 10 to 50, it will give you a bigger number.