1) in one minute for first wiil be 1/20
the other 1/30, it means that A paint in one minute 1/20 and B 1/30 then A+B in one minute 1/20 + 1/30 = 3+2/60 = 5 / 60, 5/60 = 1/12
if in one min they make 1/12 then in 12 min they paint all the wall
Ok ummm I honestly don’t know I’m so sorry I couldn’t help you wit this prob
Answer:
Thank you for the points.... lol
I'm actually doing this quiz right now, so I'll let you know what the answer is.
D/dx ( cos (4x)) = - sin (4x) · d/dx ( 4x) = - 4 sin (4x)
