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Kitty
2 months ago
14

a student says that if 5x2 = 20, then x must be equal to 2. do you agree or disagree with the student? justify your answer.

Mathematics
2 answers:
tester [12.3K]2 months ago
5 0
I disagree. Dividing both sides by 5 gives x2 = 4. Taking square roots yields x = -2 or x = 2, so x could be -2 as well as 2.
Zina [12.3K]2 months ago
5 0

We'll verify the student's claim by solving the equation step by step.

Step 1 Divide both sides of the equation by 5:

5x^2=20

\frac{5x^2}{5} =\frac{20}{5}

x^2=4

Step 2 Apply the square root to both sides:

\sqrt{x^2} =(+/-)\sqrt{4}

x=(+/-)\sqrt{4}

x=2 or x=-2

The equation has two solutions, x=2 and x=-2.

I disagree with the student because x=2 is only one root, not the sole solution; x=-2 also satisfies the equation.

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The length, breadth ND height of box are 32 cm 16cm, 8cm.wht is the maxim length of the string that can be used to measure the s
babunello [11817]

Answer:

8 cm

Step-by-step explanation:

The maximum potential length of the string corresponds to the greatest common divisor of 32, 16, and 8.

32 = 2 * 2 * 2 * 2 * 2

16 = 2 * 2 * 2 * 2

8 = 2 * 2 * 2

The GCD = 2 * 2 * 2 = 8

The greatest length of the string = 8 cm

6 0
1 month ago
Andy is designing a dice tray in the shape of a rectangular prism to use during a role-playing game. The tray needs to be three
lawyer [12517]
<span>The volume of a rectangular prism is 
 V = l · w · h
V = 252 cm3
h = 3 cm
l = 5 + W
Let W = x, therefore l = 5 + x
V = (5 + x) * x * 3 = 252
3x</span><span>^2 + 15x = 252 cm3

</span><span>This equation models the volume of the tray based on its width, x, in centimeters.
</span>3x^2 + 15x = 252 cm3<span>
</span>

for a width of 7.5 cm

3x^2 + 15x = 3*(7.5)^2 + 15*7.5 = 281.25 cm3

<span>281.25 > 252 </span><span> </span>

<span>Thus, a width of 7.5 cm is not possible.</span>


4 0
1 month ago
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Hank bought 2.4 pounds of apples . Each pound cost $1.95. How much did hank spend ont the apples ?
Zina [12379]
The response to the inquiry is 4.68.
5 0
1 month ago
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If a(x) = 2x - 4 and b(x) = x + 2, which of the following expressions produces a quadratic function?
PIT_PIT [12445]

Answer:

(ab)(x)Conclusion from the given data:

a(x) = 2x - 4b(x) = x + 2

Next, we will review each option

First option

(ab)(x)=(2x-4)(x+2)Second option

=2(x-2)(x+2)

=2(x^2-4)Third option

=2x^2-8

= x - 6

Fourth option \dfrac{a}{b}(x)=\dfrac{2x-4}{x+2}

(a-b)(x)=(2x-4)-(x+2)

= 3x - 2

=2x-4-x-2From the above evaluations, only option A results in a quadratic function

5 0
1 month ago
Josiah works at an electronics store as a salesperson. Josiah earns a 2% commission on the total dollar amount of all phone sale
tester [12383]

Response: the equations are

0.02x + 0.07y = 156

y = 300 + x

Step-by-step explanation:

Let x denote the dollar amount from phone sales made by Josiah.

Let y indicate the dollar amount from his computer sales.

Josiah receives a 2% commission on his phone sales total and 7% on his computer sales. He accumulated a total of $156 in commission, leading to the equation

0.02x + 0.07y = 156 - - - - - - - - - - -1

Furthermore, it’s given that Josiah had $300 more in computer sales than in phone sales, expressed as

y = 300 + x

4 0
1 month ago
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