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vitfil [10]
2 years ago
6

Try this trick out on a friend! Tell your friend to place a dime in one hand and a penny in the other hand. Explain that you can

determine which hand is holding the penny. Here’s how to do it: a. Ask the friend to multiply the value of the coin in his or her RIGHT hand by 4, 6, or 8 and then to multiply the value of the coin in his or her LEFT hand by 3, 5, or 7. 2. b. Now ask the friend to add the two results together and tell you the total. c. If the total is EVEN, the penny is in the RIGHT hand. If the total is ODD, the penny is in the left hand.
Mathematics
1 answer:
Svet_ta [14]2 years ago
3 0
That is so cool, thanks for the trick idea.
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in general:

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if delta=0 the equation has 1 solution

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here :

delta=-4n

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If one man can complete a work in 85/7days. In how many days 5 men can<br> finish this work?
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17/7 days will be the answer

Step-by-step explanation:

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Step-by-step explanation:

4 0
2 years ago
Find the solution of this system of equations. -x - 5y= 30, 10x + 5y= -75
madreJ [45]

Answer:

x=-5, y=-5. (-5, -5).

Step-by-step explanation:

-x-5y=30

10x+5y=-75

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x=-5

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7 0
2 years ago
It costs $2.80 to make a sandwich at the local deli shop. To make a profit, the deli sells it at a price that is 170% of the cos
Svetlanka [38]

Answer:

Sandwich sells for  $4.76  .

Step-by-step explanation:

As given

It costs $2.80 to make a sandwich at the local deli shop.

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170% is written in the decimal form

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Thus

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Sandwich selling cost = 1.7 × $ 2.80

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Therefore the Sandwich sells for  $4.76  .

7 0
3 years ago
Read 2 more answers
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