Lisa and sarah decided to meet at a park bench near both of their homes. lisa lives 1850 feet due west of the park bench and sarah lives 1430 feet due east of the park bench. they decided to leave their homes at 7: 00 pm, with sarah travelling at a constant speed of 315 feet per minute and lisa travelling at a constant speed of 325 feet per minute. the function f given by f t t ( ) = − 3280 640 gives the distance between them in terms of t, the number of minutes that have passed since 7: 00 pm what is the domain of this function in the context of the problem? write your answer as an interval.

i need the options

step-by-step explanation:

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

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)