Answer:
1. 3x+4y=30
2. 30x+40y=300
3. x+4/3y=10
Step-by-step explanation:
1/4*13=3.25 gallons
2.50*4=10
3.25+4=7.25
The answer is 7.25 gallons
There are 720 ways through which 3 numbers can be selected from 10 numbers to open a keypad lock.
Given that there are 10 numbers are 3 numbers are required to open a keypad lock.
Permutations are the number of ways in which objects can be selected without replacements to form subsets.
It is expressed as n=n!/(n-r)!.
Factorial of a number is the product of consecutive numbers less than the number.
Total numbers available=10
Numbers to be selected=3
Number of ways can be found by using permutations.
Number of ways =10
=10!/(10-3)!
=10!/7!
=10*9*8*7!/7!
=10*9*8
=720 ways.
Hence there are 720 ways through which 3 numbers can be selected from 10 numbers.
Learn more about permutations at brainly.com/question/1216161
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It's a period of time equal to 45 minutes.
___________________________
Since I posted this answer, crowds of people have complained
that I should have said how many degrees, not how many minutes.
The problem is: '3 o,clock' and '3:45' are not angles. They're both times.
I knew that right away, as soon as you called the first one ' o'clock '. So
right there, I knew that we weren't dealing with angles. The only way
I knew to answer the question was in terms of time.