The obstacle course is set up as a grid, like a giant coordinate plane. the place where helena begins is the starting point, or the origin (0,0). north is along the positive y-axis, east is the positive x-axis, south is the negative y-axis, and west is the negative x-axis.

west of checkpoint a, which is located at (0,5), there are two hurdles that helena needs to jump over. hurdle 1 is located 4 units west of checkpoint a, and hurdle 2 is located 3 units west of hurdle 1. checkpoint b is located 2 units west of hurdle 2.

what are the coordinates of checkpoint b?

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12

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

94

step-by-step explanation:

average the numbers and use a variable to figure out the minimum to get a 90.

(79+94+91+92+x)/5=90

x = 94