Answer:
4.3 hours
Step-by-step explanation:
Let the number of hours Sally does a job = x
Let the number did hours Joan does a job be equal to y
Sally and Joan were able to dust the house in 3 hours together.
1/x + 1/y = 1/3
It takes Joan 10 hours to finish the same job alone.
Hence,
1/x + 1/10 = 1/3
1/x = 1/3 - 1/10
Least common dey = 30
1/x = 10 - 3/30
1/x = 7/30
Cross Multiply
x × 7 = 30
7x = 30
x = 30/7
x = 4.2857142857 hours
Approximately = 4.3 hours
Without help, it would take Sally 4.3 hours to finish the same job.
x6y6
x4y2
xy4
Answer: The correct option is (C)
Step-by-step explanation: We are given to select the correct expression that is equivalent to the expression below:
We will be using the following properties of exponents:
We have
Therefore, the required equivalent expression is
Thus, (C) is the correct option.
The correct simplification of the expression is .
Option C. is correct.
Here, we have,
To simplify the expression, we apply the power of a power rule,
which states that .
In this case, raised to the power of 2 can be simplified as follows:
Therefore, the correct simplification of is .
Option C. is correct.
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Answer:
y=3/4x
Step-by-step explanation:
Answer:
-8y+6x=-8
Step-by-step explanation:
Can't promise this is 100% correct, but I tried.
Answer:
Using the Pythagorean theorem for isosceles right triangle, the length of the hypotenuse is sqrt( 2 x 10^2) = ~14.1 in
Hope this helps!
:)