The answer is C.
First you calculate the area of the backyard:(3x-5)*(4x-10)=12x^2-50x+50
Then you calculate the swimming pool area: (x+8)*(x-2)=x^2+6x-16
Finally, you substract the swimming pool area from the total backyard area and you get:
11x^2-56x+66 which is C.
For #1 you have to make the denominator the same so it will be 4 and 8/16 and 5 and 9/16 Then subtract them. For #3 you divide 175 by 7.
For #4 you do the number of days and multiply it by the number of people
For #5 you multiply the two numbers. For #6 you
Answer: It will take the largest pipe 5.5 hours to fill the swimming pool alone.
It will take the smallest pipe 16.5 hrs to fill the swimming pool alone.
It will take the other pipe 11 hours to fill the pool alone.
Step-by-step explanation: let time needed to fill the swimming pool by the largest pipe be x ... eq (1)
Let time needed to fill the swimming pool by the smallest pipe be 3x ... eq(2)
Let time needed to fill the swimming pool by the other pipe be 2x ...eq(3)
The job to be done (to fill a swimming pool) be 3/x +3/3x+3/2x=1 ... eq(4)
Multiply 6x on both sides you will get:
6(3)+2(3)+3(3)=6x
18+6+9=6x
33=6x
33/6=x
X=5.5hours
Substitute x=5.5 into EQ 2 and 3
3x=3×5.5=16.5hours
2x=2×5.5=11hours
Check: substitute the value of x into eq3/5.5+3/16.5+3/11
0.545+0.182+0.273=0.9997=1
Answer:
Step-by-step explanation:
Adding 2a to both sides
Taking sqrt on both sides
i cant tell you that it is from a test
