You are hired by a cell phone company to determine the height from which their ultra-durable phone can be dropped without breaking. They give you just two phones to use for testing and tell you that they know the phone will definitely break from the 100th floor of a skyscraper. Your goal is to determine the top floor from which the phone can fall without breaking. What is the most efficient approach

the system of inequalities is

step-by-step explanation:

step 1

find the equation of the dashed line

we have the points

(0,0) and (3,1)

the line passes through the origin, so, is a direct variation

find the slope

the equation of the dashed line is

the solution of the inequality a s the shaded area above the dashed line

therefore

the equation of the inequality a is

step 2

find the equation of the solid line

we have the points

(4,0) and (0,4)

find the slope

the equation of the solid line is

the solution of the inequality b s the shaded area below the solid line

therefore

the equation of the inequality b is

step 3

the system of inequalities is

18.75 gallons

step-by-step explanation:

step-by-step explanation:

the true ones are a b and d

e^-kt = n/n0 = 0.79  

-kt = ln 0.79  

t = - ln 0.79/0.0001  

= 2357 years

step-by-step explanation: