Answer:
1/28
Step-by-step explanation:
The expression is 7x-4y
Replace x by 1/4 and y by 3/7
- 7x-4y
- 7*(
) - 4*(
) multiply 1 by 7 and 4 by 3 
- 
multiply 7/4 by 7 and 12/7 ny 4 to get the same denominator 
- 1/28
Answer:
I think the volume is everything timesed by each other... soo 15x15x15x9=30375?
Step-by-step explanation:
I am very sorry if I am wrong.
Answer: the anser is
Step-by-step explanation:
9/24= 0.375 0.375x40=15
w=15 liters
Answer
22-j=
Step-by-step explanation:
Answer:
They will do rounds together again in 11 minutes and 40 seconds.
Step-by-step explanation:
Security A rounds every 2 minutes and 20 seconds in the gate 1.
That is, after 2*60 + 20 = 120 + 20 = 140 seconds.
Security B rounds every 1 minute and 40 seconds in the gate 2.
That is, after 1*60 + 40 = 60 + 40 = 100 seconds.
After how many minutes they will rounds together again?
First, we find this is seconds, which is the least common multiple between 140 and 100. Factoring them by prime factors:
140 - 100|2
70 - 50|2
35 - 25|5
7 - 5|5
7 - 1|7
1 - 1
lcm(140,100) = 2*2*5*5*7 = 700 seconds
They will do rounds together again in 700 seconds, which is 11 minutes and 40 seconds.
