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2 years ago

N is a whole number such that 6< 3n < 15 List all the possible values of n.

Mathematics

2 answers:

dezoksy [38]2 years ago

8 0

Answer:

n= 3, and n=4

Step-by-step explanation:

whole numbers are : 0,1,2,3,4,5,....

6 < 3n < 15

(3n has to be greater than 6 and less than 15 not including 6 and 15)

for n=3 we have 3n =9

for n=4 we have 3n= 12

Sav [38]2 years ago

7 0

Answer:

3, 4

Step-by-step explanation:

6 < 3n < 15

Divide the three "sides" by 3.

2 < n < 5

n must be between 2 and 5,a nd it must be a whole number.

n can be 3 or 4

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3 years ago

Julio bought 4 pencils and 3 erasers for $0.37 and David paid $0.33 for 3 pencils and 4 erasers. What is the cost of one pencil?

grigory [225]

cost of pencil = x = 0.07

and cost of eraser = y = 0.03

Step-by-step explanation:

let cost of pencil = x

and cost of eraser = y

So, we have equations:

$4x+3y=0.37\\3x+4y=0.33$

Solving both equations to find value of x and y

Let:

$4x+3y=0.37\,\,\,eq(1)\\3x+4y=0.33\,\,\,eq(2)$

Multiply eq(1) with 4 and eq(2) with 3 and subtract

$16x+12y=1.48\\9x+12y=0.99\\-\,\,\,-\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,-\\--------\\7x=0.49\\x=0.07$

Putting value of x in equation 1:

$4x+3y=0.37\\4(0.07)+3y=0.37\\0.28+3y=0.37\\3y=0.37-0.28\\3y=0.09\\y=0.03$

So, x= 0.07 and y = 0.03

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Keywords: System of equations

Learn more about system of equations at:

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3 years ago

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3 years ago

N is a whole number such that 6< 3n < 15 List all the possible values of n.​

N is a whole number such that 6< 3n < 15 List all the possible values of n.