Sarah's heart beats 2,760 times during 20 minutes of rowing. While resting, Sarah records
her heart beating 11 times in 10 seconds.
What is the difference between Sarah's heart
rate when she is rowing versus resting?

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

a reflection across the x axis and a 90 degree rotation left and right.

804.75

step-by-step explanation:

11  

13

15

hope this