Answer:
1200 miles.
Step-by-step explanation:
Let d represent one way distance.
We have been given that a plane averaged 800 mph on a trip going east, but only 400 mph on the return trip.
The time taken while going east would be .
The time taken while returning back would be .
Since the total flying time in both directions was 4.5 hr, so we will equate sum of both times with 4.5 as:
Make a common denominator:
Therefore, the one-way distance was 1200 miles.
Use the formula (b/2)^2 in order to create a new term. Solve for x by using this term to complete the square.
x = 1 ±
5/18 as a decimal:
This is quite simply to solve. The easiest way to find the decimal of an improper fraction is to divide the numerator (5) by the denominator (18). 5 ÷ 18 would be our problem. The solution can be found on a calculator or doing long division. 5 ÷ 18 = 0.2777.
Answer:
Answer:
x = 75
Step-by-step explanation:
Given information from the question:
x - 3y = 30
y = 15
We can substitute y = 15 into the equation to find x.
x - 3(15) = 30
x - 45 = 30
x - 45 + 45 = 30 + 45
x = 75
Answer: 4th option (the one already selected)
Step-by-step explanation: as the X variable changes by 7 the Y variable changes by 1