Answer:
first option
Step-by-step explanation:
3x - 7y and - 7y + 3x are equivalent expressions
3x is positive and - 7y is negative
As long as the signs on their coefficients do not change then they can be reversed, that is
3x - 7y = - 7y + 3x
Unfortunately we can’t help you unless there is a picture or you wrote the problem down here
The value of 4 is 4,000 (four thousand)
1.) 2a - 4b + 3ab -5a + 2b
= 3ab -3a -2b
2.) 4(2x+1)-3x
= 8x+4 -3x
= 5x + 4
3.) 4(p-5) +3(p+1)
= 4p-20 + 3p+3
= 7p -17
4.) 6(p+3q) - (7 + 4q)
= 6p+18q -7 -4q
= 6p + 14q -7
5.) 4rs -2s -3(rs +1) -2s
= 4rs -4s -3rs -3
= rs -4s - 3
Must click thanks and mark brainliest
Lets say, for ease, that the vat can hold a total of 70 gallons (or whatever you would like to use.) Use whatever number you want, I just picked this because it gives us a lot of clean numbers.
Now, if the inlet can fill it in 7 hours, that means that it is adding 10 gallons per hour. (70 gal/7 hours = 10 gal/hr)
For the outlet, use the same process, and you find that it drains the vat at 7 gallons per hour.
So, if you subtract the outlet from the inlet, you get 10 - 7 = 3 gallons per hour added.
Now just divide the size of the vat by that number, and you find your answer.
70 gallons / 3 gallons per hour = 23 1/3 hours.
