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Tasya [4]
3 years ago
13

elise takes 12 minutes to rake up and bag a pile of leaves her sister katherine takes twice as long, how many minutes would it t

ake both of them working together to complete 10 bags of leaves?​
Mathematics
1 answer:
Ymorist [56]3 years ago
8 0

Answer:

80 minutes

Step-by-step explanation:

Rate and Time are inverses of each other

First,

Elise Time = 12

and

Katherine Time = 2 * 12 = 24

Their rates would be (inverses):

Elise Rate = 1/12

Katherine Rate = 1/24

Together their rate is 1/12 + 1/24 = 3/24

Now, the inverse of this rate would be the time it takes to complete 1 bag together, that is:

(3/24) ^ -1 = 24/3 = 8 minutes

So, 10 bags would take them:

8 * 10 = 80 minutes

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Given:
3 kids
72 is the product of their ages.
There is a youngest child.

This means that all three are of different ages. We need to factor 72 into 3 integers.
Let us use prime factorization:

72 ÷ 2 = 36
36 ÷ 2 = 18
18 ÷ 2 = 9
  9 ÷ 3 = 3

Prime factors are: 2 x 2 x 2 x 3 x 3    OR 2³ x 3²

3 ages.

eldest      = 3³ = 9
middle     = 2² = 4
youngest  = 2¹ = 2

2 x 4 = 8
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3 years ago
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Liula [17]

Answer:

5

Step-by-step explanation:

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Brrunno [24]

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Two ants, red ant and black ant, creeping along lines in 3-space. At time t, red ant is at point on the line
mylen [45]
A. The distance between the red ant and the black ant is five units.

To represent the red ant,
xr = 3 - t 
yr = 2 + 2 t 
zr = 6 + 2 t 

To represent the black ant, 
xb = t/2 
yb = 2 + 3 t 
zb = 2 + t 

To calculate,
at t = 0 
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d = √(9+16) = √(25) = 5

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To calculate,
3 - t = t/2
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3 years ago
Find the quotient 3^15/3^3
Sati [7]

There is a property called "Quotient of powers property", which states that:

\frac{a^m}{a^n}=a^{(m-n)}

Where "a" is the common base and "m" and "n" are exponents.

For this case, you have:

\frac{3^{(15)}}{3^3}

Then, in order to find the quotient, you must apply the Quotient of powers property. You need to write the common base (in this case is 3) and then subtract the exponents.

So, you get that the quotient is:

\frac{3^{(15)}}{3^3}=3^{(15-3)}=3^{(12)}

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