To answer this item, we let x be the first positive integer. Then, the second would be x+1. Their reciprocals would be 1/x and 1/(x+1). Then, the equation that would best represent the scenario above is,
1/x + 1/(x+1) = 17/72
Solving the equation above,
((x+1) + x) / (x)(x+1) = 17/72
If we take the numerators of both sides of the equation,
(x+1) + x = 17
The value of x from the equation is 8 and x+1 would be 9. Thus, the answer would be 8 and 9.
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
The only example that does not have parallel congruent bases is the rectangular pyramid. The reason is that all pyramids are formed from a base and then all lateral faces are triangles meeting at one point on the top of the pyramid.
Answer:
I believe A is the answer.
Step-by-step explanation:
Looking at the building which is 160 ft tall, the tree is about half that size which is 80 feet.
