1.Jake and Yolanda are standing 300 yards apart. Jake spots an airplane and estimates the angle of elevation to be 30 degrees. Yolanda sees the same airplane and estimate the angle of elevation to be about 50 degrees. How far is Jake from the airplane?

671.93 yds

Step-by-step explanation:

Let x be the distance from Jake to the airplane.

300/sin(20) = x/sin(130) -> 300sin(130)/sin(20)

x= 671.93 yds

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