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Novay_Z [31]
2 years ago
7

Bethany says that 3x+6+x and 3(x+2) and equivalent expressions. She used substitution to support her answer. Explain what Bethan

y did wrong
Mathematics
1 answer:
Vinvika [58]2 years ago
3 0

She forgot about the final x at the end, because the first expression is 3x+6+x, and the second one is 3(x+2). The second one expands to 3x+6, but it doesn't have the final term at the end.

Also, 3 is not really a factor of x (technically it could be because x in unknown, but in terms of like terms and stuff it isn't) so you can't take a 3 out of x (unless you leave it as 1/3x I guess).

Anyway, yeah she forgot about the final x and therefore the factor she took out is incorrect anyway. She also could've simplified the first expression so that it became 4x + 6

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Please help me answer I need this question right, one more wrong answer and I'll fail
Shkiper50 [21]

Answer: The second option.

Step-by-step explanation:

1. Calculate the first volume assuming that the figure is completed (with no missing part). Therefore, you must apply the formula for calculate the volume of a square prism:

V_A=s^{2}*h

Where s is the side of the base and h is the height.

2. Then:

V_A=(40cm)^{2}*50cm=80,000cm^{3}

4. The volume of the missing part is calculated with the formula of a rectangular prism:

 V_B=l*w*h

Where l is the lenght, w is the width and h is the height. Then:

V_B=(40cm)(40cm-35cm)(50cm-25cm)=5,000cm^{3}

5. Therefore, you must subtract both volumes to obtained the volume of the figure:

V_f=80,000cm^{3}-5,000cm^{3}=75,000cm^{3}

6 0
2 years ago
Write x^3/2 in radical form
stiv31 [10]

Answer:

Step-by-step explanation:

I think you meant x^(3/2).  This breaks down in at least two ways:

[x^3]^(1/2), or √(x^3)m or √x³), or

[x^(1/2)]^3 = (√x)^3

3 0
3 years ago
ALMOST 50 POINTS COME AND GET IT!!!
marusya05 [52]

Answer:

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7 0
3 years ago
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sineoko [7]
The answer will be 5.

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3 0
3 years ago
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(Problem on image.)...
ANEK [815]
Hey there! :) 

In order to the find the missing side length of this triangle, we'll need to use the Pythagorean Theorem! 

That equation is : a² + b² = c²

a = adjacent side

b = long side of rectangle

c = hypotenuse

We're already given the values of both a & c, so let's plug everything in! 

a² + b² = c²  → a = 10 , b = ? , c = 20

(10²) + b² = (20²)

Simplify.

100 + b² = 400

Subtract 100 from both sides.

b² = 400 - 100

Simplify.

b² = 300

Get the square root of b² & 300.

\sqrt{b^2} =  \sqrt{300}

Simplify!

b = 17.3

So, the missing side length is the first answer choice : 17.3

~Hope I helped!~
7 0
3 years ago
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