Hi
1 mile = 5280 feet
at 90 mile per hour, you have 5280 *90 = 475 200 feets
an hour is 60*60 = 3600 second
so in 1 second the train travel : 475 200 /3600 = 4752 /36 = 132 feets
so in 10 seconds : 132*10 = 1320 feets.
Answer:
The maximum amount of profit is 32
Step-by-step explanation:
Given

Required
Determine the maximum profit
This is calculated by calculating the maximum of the function.
A quadratic function is of the form

and its maximum is:

So: 
We have that







<em>Hence, the maximum amount of profit is 32</em>
Answer:
I believe the answer is -17.
Answer:
Step-by-step explanation:
sum of angles on a straight line = 180
b + b + 148 = 180
2b + 148 = 180
Answer:
6 L
Step-by-step explanation:
Given two solutions:
1st solution is 90% saline solution. Let the volume of this solution be
litres.
2nd solution is 50% saline solution. Volume of this solution = 4 L
Resultant solution is 74% saline.
To find:
The volume of 1st solution = ?
Solution:
Total volume of the 74% saline mixture = (4+
) Litres
We can write equation here, as per the percentage of saline in the mixtures.
90% of
L + 50% of 4 L = 74% of (
+4)

Therefore, the volume must be <em>6 L</em>.