90 + 20x + 10x = 180
30x = 90
x = 3
Answer:
The order is (-10,-1,0,1,10)
Answer:
Step-by-step explanation:
+ 
← factor the denominator of first fraction
= 
+
Before adding we require the denominators to be the same
Multiply numerator/denominator of second fraction by (x + 3)
= + 
Add the numerators leaving the common denominator ( LCD = (x + 3)(x - 1) )
= 
← expand factors on numerator using FOIL
= 
=
Answer:
6 hours
Step-by-step explanation:
We can think of this problem as a "work" problem and use the formula:
work = rate x time
Let p be the rate of a single pump. So the total rate of 3 pumps is 3p. And the total time is 8 hours, so the work needed to fill a pool is:
work = 3p x 8 = 24p
We need 24p to fill up a pool.
So what happens when you have 4 pumps? That is a rate of 4p. So how much time is needed to fill up a pool that requires 24p of work?
Solve by using the work = rate x time equation:
24p = 4p x t
6 = t
6 hours.
