5*9=45 right a comparison sentence that represents this equation

Suppose that John has a pen that costs $5 and he has 9 similar pens. The total cost of the pens that John has is equal to the cost of his bag. If the cost of the bag is $45, write the verbal model of the situation.

So, cost of each pen = 5

Number of pens = 9

Total cost = 5 * 9

But, it is given that the total cost = cost of the bag and

cost of the bag = 45

So, total cost = 45 and

5 * 9 = 45.

answer: f = 32.2m

step-by-step explanation: that is the answer

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