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Greeley [361]
4 years ago
8

Someone help me with this math PlZZ!!!imma use 80 points!!

Mathematics
2 answers:
morpeh [17]4 years ago
6 0

Answer:

Step-by-step explanation:

3(x+1)=21

get the equation in parenthesis and multiply it by 3

3x+3=21

Now you subtract 3 from each side to leave 3x by itself

3x=18

now, divide 3 by each side to leave x by itself

x=6

(Hope this helps you)

LiRa [457]4 years ago
3 0

Answer:

Will you try to please repost it so i can better answer it and try to reword it some because it's a bit confusing for those who want to help me

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A mechanic sells a brand of automobile tire that has a life expectancy that is normally​ distributed, with a mean life of 27 com
Harrizon [31]

Answer:

Tires that wear out by approximately 24307.8 miles will be replaces free of charge.        

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 27,000 miles

Standard Deviation, σ = 2100  miles

We are given that the distribution of life expectancy is a bell shaped distribution that is a normal distribution.

Formula:

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

We have to find the value of x such that the probability is 0.10

P( X < x) = P( z < \displaystyle\frac{x - 27000}{2100})=0.10  

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

\displaystyle\frac{x - 27000}{2100} = -1.282\\\\x = 24307.8

Tires that wear out by approximately 24307.8 miles will be replaces free of charge.

4 0
3 years ago
Find the product of -7-i and its complex conjugate
Alchen [17]

Answer:

<h2>50</h2>

Step-by-step explanation:

-7-i\\\\\text{complex conjugate:}\ -7+i\\\\(-7-i)(-7+i)\qquad\text{use}\ (a+b)(a-b)=a^2-b^2\\\\=(-7)^2-(i)^2\qquad\ i=\sqrt{-1}\to i^2=-1\\\\=49-(-1)\\\\=49+1\\\\=50

8 0
3 years ago
What is the quadratic in vertex form that has an a value of 8 and a vertex of (5, 6)?
faltersainse [42]

Answer:

y= 8(x-5)² + 6

Step-by-step explanation:

Parabolas have two equation forms, namely; the standard and vertex form.

In the vertex form, y = a(x - h)² + k, the variables h and k are the coordinates of the parabola's vertex.

In this case; a=8, h =5, and k=6

Therefore;

The vertex equation will be

y= 8(x-5)² + 6

8 0
3 years ago
Read 2 more answers
In each of prob- lems 1 through 6, use theorem 2.4.1 to determine (without solving the problem) an interval in which the solutio
storchak [24]
Were are the problems i Cannot see them bro Sorry
6 0
4 years ago
Use the value of x to find the measure of angle 1
suter [353]
We know that the angle of a straight line is 180°.

So we know that (5x-5) + (2x+10) = 180
We will then solve for x

5x - 5 + 2x + 10 = 180

7x + 5 = 180

7x = 175

x = 25 (just an explanation of how we get 25)

To get angle 1, we will then plug in x=25 into the first equation to get

5(25)-5 = 125-5 = 120°
7 0
3 years ago
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