Find the speed of the train:
67.5 mi
---------- = 45 mph
1.5 hr
Then (distance traveled) = (speed)*(time) => d = (45 mph)(t)
2x - 3 = 11
2x = 14
x = 7
Using this value, The answers would be the following:
A. 23/21 (assuming you are dividing 2 by 3x; if you multiplied 2/3 by x, the answer would then be 17/3)
B. 21/2
This is your perfect answer
Y=4cos(2x)sin
We determine the minimum and maximum scores that Juan needs to get in order to be within the strict average range. We let x be his score.
minimum:
74 = (82 + x) / 2
The value of x from the equation is equal to 66.
maximum:
80 = (82 + x )/2
The value of x from the equation is equal to 78.
Hence, Juan's score should fall between 66 and 78, inclusive.
Answer: <em> 66 ≤ x ≤ 78</em>
