Answer:
Option B. is correct
Step-by-step explanation:
Let 
denotes time taken by Mia alone to clean the room and 
denotes time taken by Holly alone to clean the room.
As Mia and Holly can clean their room in 20 min, working together,
Also,
Mia, working alone, can do the job in 30 min.
So,
Put (ii) in (i)
Therefore,
Holly can clean the room alone in 60 minutes.
Option B. is correct
57 miles about I'm not positive but I think this is right
(6.5,7.5) is the midpoint c
hello :<span>
<span>an equation of the circle Center at the
A(a,b) and ridus : r is :
(x-a)² +(y-b)² = r²
in this exercice : a = 1 and b = -1 (Center at A (1 , -1)
r = AP
r² = (AP)² ....... P(3,2)
r² = (3-1)² +(2+1)² = 4+9=13
an equation of the circle that satisfies the stated conditions.
Center at </span></span>A (1 , -1) , passing through P(3, 2) is : (x-1)² + (y+1)² = 13²
A.51
because 5x15=75, 8x3=24, 75-24=51
