PLEASE HELP IM ON A TIME CRUNCH The temperature falls from 0 degrees to Negative 12 and one-fourth degrees in 3 and one-half hours. Which expression finds the change in temperature per hour? Negative StartFraction 7 over 2 EndFraction divided by StartFraction 49 over 4 EndFraction Negative StartFraction 7 over 2 EndFraction times StartFraction 49 over 4 EndFraction Negative StartFraction 49 over 4 EndFraction times StartFraction 7 over 2 EndFraction Negative StartFraction 49 over 4 EndFraction divided by StartFraction 7 over 2 EndFraction

  Negative StartFraction 49 over 4 EndFraction divided by StartFraction 7 over 2 EndFraction;

49/4 ÷ 7/2

Step-by-step explanation:

Initial temperature: 0°

Final temperature: -12 1/4 ° = -(12x4 +1)/4 = -49/4  

Time: 3 1/2 hours = (3x2+1)/2=7/2 hours

We have to apply the next formula:

∆T = r × t

r= ∆T/t

Where:

r =Rate of change of temperature

t =time = 7/2 hours  

∆T =overall change in temperature = (-4.9/4-0)

Replacing with the values given:

(-12 1/4 -0 )/3 1/2= -49/4 ÷ 7/2 = -7/2

Negative StartFraction 49 over 4 EndFraction divided by StartFraction 7 over 2 EndFraction

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