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Mathematics

2 answers:

Fed [463]2 years ago

7 0

Answer:

Square root of 54 and square root of 120

Step-by-step explanation:

lina2011 [118]2 years ago

3 0

Answer:

$\sqrt{54}$ and $\sqrt{120}$

Step-by-step explanation:

If a number 'x' is a perfect square, then $\sqrt{x}$ is rational.

25, 36 and 81 are perfect squares, but 54 and 120 aren't, so the irrational values are $\sqrt{54}$ and $\sqrt{120}$

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What is the value of y in this system of equations: 3x + y = 9 y = –4x + 10 ?

Ahat [919]

3x + y = 9 (I)
y = –4x + 10 (II)
------------------------
 $\left \{ {{3x + y = 9 } \atop {y = -4x + 10 }} \right.$

Pass the incognito "4x" to the first term, changing the signal when changing sides.
-------------------------
simplify by (-1)
 $\left \{ {{3x + y = 9.(-1)} \atop {4x + y = 10 }} \right.$ 

-------------------------
 $\left \{ {{- 3x - \diagup\!\!\!\!y =-9} \atop {4x + \diagup\!\!\!\!y = 10}} \right. 
$

-------------------------
 $\left \{ {{- 3x = - 9} \atop {4x = 10}} \right.$ 

-----------
 $\boxed{x = 1}$ 

Substitute in equation (I) to find the value of "Y".

3x + y = 9 (I)
3*(1) + y = 9
3 + y = 9
y = 9 - 3
$\boxed{y = 6}$

Answer:
$\boxed{\boxed{ \left \ {{x=1} \atop {y=6}} \right. }}$

6 0

2 years ago

For somebody that need it

djverab [1.8K]

Answer:

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Step-by-step explanation:

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2 years ago

The Party Room at Penny's Pizza rents for an initial fee of $30 and then $5 per hour. Aislyn's bill for her Birthday party was $

Annette [7]

Initial fee- $30
$5 per hour
=$50

$5* 4(hours)=$20
$30+$20=$50