Answer:
12 hours
Step-by-step explanation:
Given data
Steve= 4 hours
Steve and Andrea= 3 hours
Applying the combined work formula
1/A+1/B= 1/T
1/4+1/B= 1/3
solve for B
B+4/4B= 1/3
cross multiply
3(B+4)= 4B
3B+12= 4B
12= 4B-3B
12= B
Hence Andrea will spend 12 hours alone
Answer
Mandisa uses more balloon per animal.
Amira and Mandisa made the same amount of balloon animals.
Explanation
Mandisa uses 5 balloons per animal.
You can find this out by putting the difference between two of the y values (output, dependent variable, in this case balloons) over the difference between two of the x values (input, independent variable, in this case animals). Let's take 225 and 125 from the y value and 20 and 40 from the x value. Mandisa uses 225-125=100 balloons per 40-20=20 animals. Mandisa uses 5 balloons per animal. 5 is more than 4 (how many balloons Amira uses for each animal), so Mandisa uses more balloons per animal.
Amira and Mandisa made the same amount of balloon animals.
Now you can divide the number of balloons they had at the beginning by the number of balloons per animal to find out how many animals each person made. Amira started with 260 balloons and used 4 balloons for each animal. Amira made 260/4=65 animals.
If Mandisa used 100 balloons to make 20 animals, she would have had 225+100=325 balloons at the beginning. Mandisa made 325/5=65 animals.
1) 0.4
2)0.875
i dont know the 3 and 4 one
Answer:
C. Sample: Every animal's name is dropped into a container, and 15 names are pulled out of it.
Step-by-step explanation:
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