Between 7 pm and 7am 12 hours passed. The temperature changed a total of 12 degrees. 12 degrees/ 12 hours gives you the answer of 1 degree F per hour.
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Answer:
45 students speak Spanish at Francis Lewis High School
Step-by-step explanation:
Option1:

18000 = 400x
x = 45 students speak Spanish at Francis Lewis High School
Option2:
72 ÷ 400 = 0.18
0.18 * 250 = 45 students speak Spanish at Francis Lewis High School
Step-by-step explanation:
1: Solve one Equation for one of the variables
2: Substitute (plug-in) this expression into the other equation and solve
3: Resubtitue the value into the original equation to find the corresponding variable
X is 995,000
d is 100,000 respectfully