The temperature in the ice rink must stay below 50°f this morning the temperature was 71 degrees fahrenheit the icing runs a cooling device that can decrease the temperature by 3.5° every hour how many hours will it take for the temperature to fall below 50°

The temperature needs to decrease 71° - 50° = 21° that at least not greater than 50°F

As we know, the device decrease the temperature down 3.5° every hour, so

21 : 3.5 = 6 hour

Call x is the hours we need to wait to let the device decrease, we have

x > 6

it will take 6 hours to fall to 50 degrees, but it will take 7 hours to fall below 50 degrees.

Step-by-step explanation:

take 71 on your calculator and just subtract 3.5 until you get to 50 or below.

the required function is .

step-by-step explanation:

from the given table it is noticed that the graph passing through (-3,7), (0,4), (3,1) and (8,-4).

it is a linear function because the value of y is decrease by one as the value of x increase by 1.

the slope of the function is

the slope of the function is -1 and the y-intercept is 4.

the slope intercept form is

where, m is slope and b is y-intercept.

therefore the required function is . the graph of this function is shown below.

answer:   y=2x-3

step-by-step explanation: