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.
I dont know this answer so very sorry hope i helped :D
Answer:
9 + 12
Step-by-step explanation:
9 - (-12)
Subtracting a negative is like adding
9 + 12
21
Answer:
i got 1/12 for 5, 12 for 6, and 1/12 for 7. 8 is 3/2, 9 is 4/5, 10 is 4/9, 11 is 2 1/2.
Answer:
To evaluate an algebraic expression, you have to substitute a number for each variable and perform the arithmetic operations. In the example above, the variable x is equal to 6 since 6 + 6 = 12. If we know the value of our variables, we can replace the variables with their values and then evaluate the expression.
Step-by-step explanation: