Answer:
The time it takes them to grade the essays if they work together is 1.857 hours
Step-by-step explanation:
- Let t1 is time taken by Professor J = 3 hours
- Let t2 is time taken by the assistant = 5 hours
- Let tb is the time taken by both
The formula for “Work” Problems that involve two persons is
<=>
<=>
<=> tb =
The time it takes them to grade the essays if they work together is 1.857 hours
Answer:
i think its 80.64 i don’t know if its correct
Step-by-step explanation:
Im pretty sure its A!
explanation:
Since its going from the top doen it indicates its a negative , so that deleted B and C from your options. Then because of how scattered it is its most likely a number that isnt comolete. Therefore its A!
Answer:
15
Step-by-step explanation:
Let's first retrace her steps
using PEMDAS we know that we first have to do the operations in parenthesis then multiply before we add or subtract so we have
so far so good now lets check the other side
from this we can determine that all of her math is correct. However, to say that two expressions are equivalent you have to substitude the same number on both expressions and get the same answer. Since she did not do this, amd used x=1 on one expression and used x=-1 on th other her answer is incorrect.