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erica [24]
3 years ago
9

11. Solve 5(2x – 3) = x – 15 + 9x for x.

Mathematics
1 answer:
zepelin [54]3 years ago
4 0

Answer:

\boxed{\bold{True \ For \ All \ x}}

Explanation:

[ Step One ] Group Like Terms

\bold{5\left(2x-3\right)=x+9x-15}

[ Step Two ] Combine Similar Elements: \bold{x+9x=10x}

\bold{5\left(2x-3\right)=10x-15}

[ Step Three ] Expand \bold{5\left(2x-3\right): \ 10x-15}

\bold{10x-15=10x-15}

[ Step Four ] Add 15 To Both Sides

\bold{10x-15+15=10x-15+15}

[ Step Five ] Simplify

\bold{10x=10x}

[ Step Six ] Subtract 10x From Both Sides

\bold{10x-10x=10x-10x}

[ Step Seven ] Simplify

\bold{0=0}

[ \boxed{\bold{Final \ Answer}} ]

➤ \bold{Both \ Sides \ Are \ Equal, \ True \ For \ All \ x}

\boxed{\bold{Mordancy}}

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Lady bird [3.3K]
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5 0
3 years ago
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The number of charter schools is 4 less than twice the number of alternative schools and there are 48 charter schools how many a
jarptica [38.1K]
Let x = the number of alternative schools.

Therefore, 2x - 4 = 48.
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                  2x = 52
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Therefore, there are 26 alternative schools(You could check this answer by substituting x=26 into the equation above.).
7 0
3 years ago
How many solutions does this system of equations have?<br> y = –2x + 3<br> y = –2x – 1
Nadusha1986 [10]

Answer:

Step-by-step explanation:

in y = mx + b form, the slope is in the m position and the y int is in the b position

y = -2x + 3.....slope is -2 and y int is 3

y = -2x - 1...slope is -2 and y int is - 1

same slope, different y int's....means parallel lines...NO SOLUTION

learn this...it helps

same slope, different y int's = no solution

different slopes, different y int's = 1 solution

same slope, same y int's = infinite solutions

6 0
3 years ago
Mrs. Davis bought 6 pounds of grades for $18. At this rate, how much would 72 ounces of grapes have cost?
saveliy_v [14]
This the problem we are looking at: 6 pounds/18 = 72 ounces /?
To solve this, we have to make the unit of measurement the same. There are 16 ounces in 1 pound. So, there are 72 ounces in 4.5. To find that you just do 72 divided by 16. This is the new problem we are looking at: 6 pounds/18 = 4.5 pounds/?
To find ?, you must divided 6 divided by 4.5 to find the difference between the two to keep the same rate. That equals 1.33333333. 
What is done to the numerator, you must do to the denominator to keep the same rate so now you divide 18 divided by 1.33333333 which equals 13.5

So for 72 ounces (4.5 pounds) it will cost $13.50

I hope this helps:)
4 0
3 years ago
A large stockpile of used pumps contains 20% that are currently unusable and need to be repaired. A repairman is sent to the sto
Scrat [10]

Answer:

Expected value = 190

Variance = 4000

Step-by-step explanation:

Let X be the number of the trials until the third success of the bad pump.

This implies that X is a negative binomial distribution having θ = 20% = 0.2.

Now, if for example it will take X trials to use up the three pumps, then the total time is 10 min/trials + extra 10 minutes for the 3 bad pumps

This means the total time is written as;

T = 10X + (10 + 10 + 20)

T = 10X + 40

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Variance of X is; σ²_x = 40

Thus;

Mean of T will be;

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μ_T = 190

Also, variance of T will be;

σ²_T = 10²•σ²_x

σ²_T = 100 × 40

σ²_T = 4000

7 0
3 years ago
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