Part A:
Given that Starlight tree farms sells Douglas Firs and Noble First.
Let n be the number of Noble Fir trees sold, then if they sold 139 more Douglas First than Noble Firs, this means that the number of Douglas First trees sold is n + 139.
Given that the total number of trees sold was 377, then we have, n + n + 139 = 377, which means that 2n + 139 = 377
Therefore, the equation that could be used to solve for n, the number of Noble Fir trees sold is 2n + 139 = 377.
Part B:
Given that you are driving 55 miles per hour and you must drive a total of 440 miles. If you already driven 275 miles, then, the equation representing the number of hours, h, it will take to reach your destination is given by 55h + 275 = 440.
Subtracting 275 from both sides of the equation gives:
[tex]55h+275-275=440-275 \\ \\ \Rightarrow55h=165[/tex]
Dividing both sides by 55 gives:
[tex] \frac{55h}{55} = \frac{165}{55} \\ \\ \Rightarrow h=3[/tex]
Therefore, the time it will take you to reach your destination is 3 hours.
