Sally and Joan were able to dust the house in 3 hours together. It takes Joan 10 hours to finish the same job alone. Without help, how long would it take Sally to finish the same job ?
Answers
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.
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Answers
Answer:
Y = 0
Step-by-step explanation:
Y = -1/2 x²
To find y-intercept, substitute X = 0
Solve the equation for y
Y = 0
Answers
F is 1 x 2 x 12
G is 1 x 3 x 8
H is 1 x 4 x 6
I is 2 x 2 x 6
J is 2 x 3 x 4
Happy to Help!
Answers
Answers
Answer:
100 unit^2
Step-by-step explanation:
lateral surface area of right pyramid = .5*p*s
p = perimeter
s = slant ht
LS = 100 unit^2
Answers
- both have the same symmetry axis: y = x
- both are hyperbolas
- both have the same asymptotes: the y-axis, i.e. y = 0
- both have the same limits when x approaches 0 by the right and by the left: positive and negative infinity.
- both have the same limits when x approaches + and - infinity: zero.
- they never touch one to each other
Answers
both numbers are negative
negative number is greater than the positive number
Explanation:
In order to add two rational numbers and get a negative value, one of two scenarios should occur:
1- both numbers are negative.
In this case, the answer would definitely be negative as the two numbers are originally negative
Examples:
-9 + -2 = -9 - 2 = -11
2- negative number is greater than the positive number
In this case, the negative sign would dominate and the result would be negative
Examples:
-9 + 3 = -6
Hope this helps :)
-- If both of them are negative,
or
-- If their signs are different and the negative number has
a bigger absolute value than the positive one,
then
-- Their sum is negative.
Actually, I don't think it matters whether they're rational or not.