The square root of 9 is 3
Answer:
It is the Commutative property.
Step-by-step explanation: The word commutative comes from the word "move around" in this case all the numbers did was switch positions. Another example; 2+3=3+2 that is commutative property because the numbers were moved. Much similar to your problem
let's label each pump A, B, and C, just for convenience. A fills the tank by 1/50 every minute, B fills the tank by 1/60 every minute, and C drains it by 1/75 every minute. Now we can put them all into one function: t(1/50 + 1/60 - 1/75) = 1, where t = our time in minutes and 1 = the tank being full.
next, we solve for t: t = 300/7 minutes, or approximately 42.86 minutes.
Answer:
Step-by-step explanation:
2x² + x -1 = 0
x² + x² + x -1 = 0
(x² - 1) + x² + x =0
(x + 1) (x - 1) + x(x + 1) =0
(x+1) (x - 1 + x) = 0
(x + 1)(2x - 1) = 0
1. Taking a cube root
2. Taking a square root