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Mars2501 [29]
3 years ago
12

Which of the following are solutions to the equation below? Check all that apply. 9x^2-64=0

Mathematics
1 answer:
nikdorinn [45]3 years ago
4 0

Answer:

E. -8/3

F. 8/3

Step-by-step explanation:

9x^2-64=0

Add 64 to each side

9x^2-64+64 = 0+64

9x^2 =64

Divide each side by 9

9x^2/9 = 64/9

x^2 = 64/9

Take the square root of each side

sqrt(x^2) = ±sqrt(64/9)

We know that sqrt(a/b) = sqrt(a)/sqrt(b)

x = ±sqrt(64)/sqrt(9)

x = ± 8/3

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Now divide both sides by 5 and you get 12=x Hope this helps!





8 0
3 years ago
The price of a dress is reduced by 60%.When the dress still does not​ sell, it is reduced by 60% of the reduced price. If the pr
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Answer:

1. $450

2. $128

Step-by-step explanation:

1. new price = .4 (.4 * original price x)

72 = .16x

x = 450

2. new price = .75 (.75 * original price x)

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3 years ago
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8 0
3 years ago
40 percent of 1000000
OverLord2011 [107]
<span>40% of 1000000 is 400000. </span>
8 0
3 years ago
The lengths in cm, of the sides of a triangle are 3x - 5, 2x-1 and x+1
Dennis_Churaev [7]

Answer:

a) p = 6x - 5

b) x = 6

Step-by-step explanation:

a) p = a + b + c

p = 3x - 5 + 2x - 1 + x + 1

p = 6x - 5

b) p = 6x - 5 =31

6x - 5 = 31

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x = 6

3 0
2 years ago
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