The temperature on feb 18th in fargo, N, D was recorded 5am, temp is -15 Fahrenheit

9am, temp is 22 Fahrenheit

2pm, temp is 38 Fahrenheit

6pm. temp is -15 Fahrenhet

find the change in temperature from:

5am to 9am

2pm to 6 pm

is means division by fractions

step-by-step explanation:

let x and 400 - x be the two numbers.  

==> 0.80x + 0.85(400 - x) = 400 - 68 from the statement of the problem.  

< ==> 0.80x + 0.85(400 - x) = 400 - 68  

==> 340 - 0.05x = 332  

< ==> -0.05x = -8 ==> x = 160, the first number ==> 400 - x = 240, the second number.