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3 years ago

Each month, Ellie spends 4 hours in tap class at her dance studio. If each month she spends 20% of her class time in tap

Mathematics

2 answers:

marysya [2.9K]3 years ago

8 0

Answer:

4 / 20% = 20 hours total

Brut [27]3 years ago

5 0

I’m pretty sure her total time would be 20 hours because if 20% is 4 hours and you divide 100% by 20% which is 5 you multiply 4 times 5 and you get 20 hours. Hope this helped!!

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kobusy [5.1K]

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3 years ago

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A spring has natural length 20 cm. Compare the work W1 done in stretching the spring from 20 cm to 30 cm with the work W2 done i

sashaice [31]

Answer:

W1 = W2 = 50k Joules (assuming W1 and W2 have the same force constant, k)

W1 - W2 = 0

Step-by-step explanation:

Work done in stretching a spring is given by 1/2ke^2

Where, k is force constant and e is extension

e1 = 30cm - 20cm = 10cm

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago

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Leona [35]

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2 years ago

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zubka84 [21]

Answer:

$35\ ways$

Step-by-step explanation:

we know that

<u><em>Combinations</em></u> are a way to calculate the total outcomes of an event where order of the outcomes does not matter.

To calculate combinations, we will use the formula

$C(n,r)=\frac{n!}{r!(n-r)!}$

where

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r represents the number of items being chosen at a time.

In this problem

$n=7\\r=3$

substitute

$C(7,3)=\frac{7!}{3!(7-3)!}\\\\C(7,3)=\frac{7!}{3!(4)!}$

simplify

$C(7,3)=\frac{(7)(6)(5)4!}{3!(4)!}$

$C(7,3)=\frac{(7)(6)(5)}{3!}$

$C(7,3)=\frac{(7)(6)(5)}{(3)(2)(1)}$

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3 years ago