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oksano4ka [1.4K]
3 years ago
9

Solve. x^2 - 49 = 0 A) ±49 B) ±12 C) ±7 D) ±6

Mathematics
2 answers:
xeze [42]3 years ago
7 0
(X+7)((x-7)

This is call the difference of squares because there is no middle number and the last number is a square like 7×7 is 49
X+7=0. X-7=0
X=-7. X=7
C
zlopas [31]3 years ago
3 0
The answer is c
x^2 = 49
x = √49
√49 = ±7
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siniylev [52]

Answer:

Don't worry, there is no solution.

Step-by-step explanation:

If you end up with 0 equaling something that isntn0 when you're simply solving a variable, there is no solution. But if you get 0=0, it's all real numbers.

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4. Elena noticed that, nine years ago, her cousin Katie was twice as old as Elena was then,
kakasveta [241]

Answer:

k - 2e + 9 = 0

k - e - 4 = 0

Step-by-step explanation:

Given that Elena is currently e years  old and Katie is k years old. Now, nine years ago, Katie was twice as old as Elena was.

So, k - 9 = 2(e - 9)

⇒ k - 2e + 9 = 0 .............. (1)

And, in four years, Elena will be as old as Katie is now.

So, k = e + 4

⇒ k - e - 4 = 0 ............... (2)

Therefore, the equations (1) and (2) matches the conditions. (Answer)

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2 years ago
Mr. Harper's car used 5 gallons of gasoline to travel 150 miles. After he had some work done on the cars engine ,it used it used
Doss [256]

Answer:

38.5 dollars

Step-by-step explanation:

Because if he used 3.50 dollars per a gallon that makes

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3 0
2 years ago
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A spinner is divided into 8 section of equal size. The sections are numbered 1 through 8. Use this information to determine the
olga_2 [115]

1) 1/8

2) 1/2

Step-by-step explanation:

1)

First of all, we notice that the spinner is divided into 8 sections of equal size.

So the number of sections is

n = 8

Secondly, we note that each section has the same size: this means that the probability of the spinner landing on each section is the same.

The probabilty of a certain event A to occur is given by

p(A)=\frac{a}{n}

where

a is the number of successfull outcomes (in which A occurs)

n is the total number of possible outcomes

Here we want to find

p(7) = probability that the spinner lands on section 7

Here we have:

a=1 (only 1 outcome is successfull: the one in which the spinner lands on section 7)

n=8

Therefore, the probability is

p(7)=\frac{1}{8}

2)

Here we want to find the probability that the spinner lands on an even numbered section.

As before, the total number of possible outcomes his:

n=8

which corresponds to: 1, 2, 3, 4, 5, 6, 7, 8

The even-numbered sections are:

2, 4, 6, 8

So, the number of successfull outcomes is

a=4

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Therefore, the probability that the spinner lands on an even numbered section is:

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8 0
2 years ago
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alina1380 [7]

Answer:

125.7 square inches

Step-by-step explanation:

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7 0
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