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Mumz [18]
3 years ago
11

- (-2(-x2)2) =

Mathematics
1 answer:
Tresset [83]3 years ago
3 0

Answer:

-4x

Step-by-step explanation:

you first distribute the negative sign or multiply by -1 and get 2[x*-2]*-2. you then distribute the 2 in front of the parenthesis to get 2x*-2. You then just multiply the whole thing by -2 to get you answer of -4x

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Step-by-step explanation:

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3 years ago
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An index that is a standardized measure used in observing infants over time is approximately normal with a mean of 90 and a stan
weqwewe [10]

Answer:

The proportion of children that have an index of at least 110 is 0.0478.

Step-by-step explanation:

The given distribution has a mean of 90 and a standard deviation of 12.

Therefore mean, \mu = 90 and standard deviation, \sigma = 12.

It is given to find the proportion of children having an index of at least 110.

We can take the variable to be analysed to be x = 110.

Therefore we have to find p(x < 110), which is left tailed.

Using the formula for z which is p( Z < \frac{x - \mu}{\sigma}) we get p(Z < \frac{110 - 90}{12} = 1.67).

So we have to find p(Z ≥ 1.67) = 1 - p(Z < 1.67)

Using the Z - table we can calculate p(Z < 1.67)  = 0.9522.

Therefore p(Z ≥ 1.67) = 1 - 0.9522 = 0.0478

Therefore the proportion of children that have an index of at least 110 is 0.0478

8 0
3 years ago
one of the solutions to x2 − 2x − 15 = 0 is x = −3. what is the other solution? x = −5 x = −1 x = 1 x = 5
Goryan [66]
x^{2} -2x-15=0
P(-15)
s(-2)
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3 0
3 years ago
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Norma-Jean [14]
Plug it into the distance formula.

d= (sqrt) (x2-x1)^2 +(y2-y1)^2

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d= (sqrt) (54)^2
d= (sqrt) 2916
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The distance is 54 units. 

I hope this helps!
~kaikers
7 0
3 years ago
Which is TRUE about ALL expressions?
Zanzabum

Expressions do not have an equal sign (although they can have operators such as plus or minus).

2x+1 is an expression.

2x+1=1 is an equation since it has an equal sign.

8 0
2 years ago
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