The formula d= 1/2 + 26 relates the nozzle pressure n (in pounds per square inch) of a fire hose and the maximum horizontal distance the water reaches d (in feet). How much pressure is needed to reach a fire 50 feet away?

Pressure needed to reach a fire of 50 feet way.

Step-by-step explanation:

Given:

⇒ nozzle pressure n (in pounds per square inch) of a fire hose

⇒ maximum horizontal distance the water reaches  (in feet)

We need to find the nozzle pressure of a fire hose when distance is 50 feet.

Solution:

Now we can say that;

Substituting the value of d in above equation we get;

Subtracting both side by 26 we get;

Multiplying both side by 2 we get;

Hence pressure needed to reach a fire of 50 feet way.

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

this answer is !