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3 years ago

If x2 - 4 = 45, then x could be equal to 9 3 5 -7 -4

1 answer:

5 0

Transpose the constant on the left hand side of the equation to the right side. The equation becomes x² = 45 + 4,
x² = 49
x = sqrt(49)
x = 7 and x = -7
Only -7 is on the choices. Thus, the answer is x = -7.

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The lengths of the sides of an equilateral triangle are 3(x + )cm, (5x +2y-1) cm and 5x +1 Cm Find the side length of the triang

pochemuha

Answer:

Correct option is A

Since it is an equilateral triangle, the lengths of the sides are equal

So, x+3 y=3 x+2 y−2=4 x+

y+1

x+3 y=3 x+2 y−2

y=2 x−2

2 x−y=2 ...(1)

Also, 4 x+

y+1=x+3 y

8 x+y+2=2 x+6 y

6 x+2=5 y

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Multiplying e q(1) by 5 we get,

10 x−5 y=10 ...(3)

Subtracting e q(2) from e q(3) we get,

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3 years ago

ONE VARIABLE INEQUALITIES WORD PROBLEM ••Ben is twice his brother's age. If the sum of

Nat2105 [25]

Answer:

Step-by-step explanation:

Let brother's age = x

Ben age = 2x

2x+x =81

3x =81

x =27

Ben's brother's = 27

7 0

2 years ago

The daily sales at a convenience store produce a normal distribution with a mean of $1,250 and a standard deviation of $125. The

timama [110]

Answer:

0.6844 is the required probability.

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = $1,250

Standard Deviation, σ = $125

We are given that the distribution of daily sales is a bell like shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

We have to find

P(sales less than $1,310)

$P( x < 1310) = P( z < \displaystyle\frac{1310 - 1250}{125}) = P(z < 0.48)$

Calculation the value from standard normal z table, we have,

$P(x < 1310) =0.6844= 68.44\%$

0.6844 is the probability that sales on a given day at this store are less than $1,310.

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3 years ago

What is an "outlier" and how does it effect data like: mean, median and mode

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An outlier affects mean the most

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3 years ago

Are the expressions 3x + 8 and 2x + 14 equivalent expressions for x = 6? How do you know?

siniylev [52]

Answer:

Equivalent

Step-by-step explanation:

both give 26 as answer

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3 years ago