En 403 5.0 cm
(b)
The pie chart shows the
distribution of textbooks to six classes A.
B, C, D, E and F in a school.
3
A
B
F
6050
70°
rs are
80
72-
Nor DRAWN TO SCALE
ven
(1) If Class D was given 720 textbooks,
how many textbooks were distributed to
each of the remaining classes?
Fin​

the ratio of balloons to tables is 5: 2 and the constant variation is 5.

the equation is y=5x

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9

answer: x=3 and y=4

step-by-step explanation: