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3 years ago

4z2+8z+4=0 is it soluton or no solution or two real solution

Mathematics

2 answers:

Darina [25.2K]3 years ago

6 0

One solution

4(z+1)^2=0
Divide by 4

(z+1)^2=0

Square root each side

Z+1=0

Subtract 1 from both sides
z=-1

EastWind [94]3 years ago

3 0

Answer:

one solution

Step-by-step explanation:

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20 POINTS!!!!!!!

zavuch27 [327]

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3 years ago

What is the slope of th line that contains the points (-1, 8) and (5, -4)

In-s [12.5K]

so you just do the slope formula

which y2-y1 over x2-x1 in fraction form

so you would do

(-1 , 8) (5 , -4)

(x1 , y1) (x2 , y2)

-4 - 8 over 5- (-1)

which would give you the fraction 12/6

it can be simplified to 2

so 2 is your slope

hope it help

3 0

3 years ago

Read 2 more answers

A distribution of scores for a test of life stressors has a mean of µ = 125 and standard deviation of σ = 15. The researcher cal

laila [671]

Answer:

The mean and standard deviation for the z-scores in this distribution are 0 and 1 respectively.

Step-by-step explanation:

Let the random variable X follow a Normal distribution with mean μ and standard deviation σ.

The z-scores are standardized form of the raw scores X. It is computed by subtracting the mean (μ) from the raw score x and dividing the result by the standard deviation (σ).

$z=\frac{x-\mu}{\sigma}$

These z-scores also follow a normal distribution.

The mean is:

$E(z)=E[\frac{x-\mu}{\sigma} ]=\frac{1}{\sigma}\times [E(x)-\mu] =\frac{1}{\sigma}\times [\mu-\mu]=0$

The standard deviation is:

$Var(z)=Var[\frac{x-\mu}{\sigma} ]=\frac{1}{\sigma^{2}}\times [Var(x)-Var(\mu)] =\frac{\sigma^{2}-0}{\sigma^{2}}=1\\SD(z)=\sqrt{Var(z)}=1$

Thus, the mean and standard deviation for the z-scores in this distribution are 0 and 1 respectively.

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3 years ago

Six friends order lunch. Write an expression that shows the total cost if each person orders on sandwich and one cookie.

vodka [1.7K]

4.75×6=28.5
6 cookies= 6x
The expression is 6x+28.5

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4 years ago

Pamela is working during summer vacation to buy a $500 bike. If she works for 4 weeks and buys the bicycle, how much money will

dimaraw [331]

Answer:

Not enough information to solve

Step-by-step explanation:

In order to find the answer, you will need to know how much she makes in those 4 weeks, then subtract 500 from the total amount made

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3 years ago