1. -2
2. 4
Is the answers to the following questions
Answer:
<h2>18mins</h2>
Step-by-step explanation:
This problem is on combined work rate
given that
Marta can vacuum the house in 30 min
then her rate= 1/30
Also, her daughter will take 45 min to vacuum the house
her daughter's rate will be = 1/45
then the combined work rate is
1/30+1/45=1/T
30+45/30*45=1/T
75/1350= 1/T
1/18=1/T
This means that they will both take 18 minutes working together to vacum a house

We're given that
and
, and want to find
.
By the chain rule, we have

and


Then

(because the point
corresponds to
)

Answer:
78.54
Step-by-step explanation:
Hope this helps!