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MrRa [10]
2 years ago
5

What is 19-3x=21+x and how do i show my work

Mathematics
2 answers:
Murljashka [212]2 years ago
6 0
19-3x=21+x
Add 3x to both sides. 
19-3x+3x=21=x+3x
19=21+4x
Subtract 21 from both sides.
19-21=21+4x-21
-2=4x
Divide both sides by 4.
-1/2=x

Hope this hleped!

irga5000 [103]2 years ago
4 0
Subtract 19 from both sides
-3x=2+x

Subtract x from both sides
-4x=2

Divide both sides by -4
x=-1/2

Final answer: x=-1/2
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2y = x - 4<br> 4x + 3y = 5
MakcuM [25]

Answer:

the answer is, {x,y} ={2,1}

Step-by-step explanation:

1) 4x - 3y = 5     2) x + 2y = 4   3) 4•(-2y+4) - 3y = 5     4) - 11y = -11                         5) 11y = 11   y = 1    6)   x = -2y+4 y = 1    7)   x = -2(1)+4 = 2 = {x,y} = {2,1} !!!

8 0
3 years ago
One day, he bought 10 pairs of socks for $2.50 each and 3 pairs of shoes for dollars each. He
IrinaVladis [17]

Answer:

2.50(10) + 3x = 135.97, x = 38.66

Step-by-step explanation:

This should be pretty simple.

Basically, we know that he bought 10 pairs for 2.50 so that's $25 right there.

Our total is 135.97 though-

so here, we take our total from the right side of the equation, and subtract 25 from that.

135.97 - 25 = 115.97

Since he bought three pairs, divide it by 3.

115.97 / 3 = 38.66

One pair of shoes costs $38.66 - hope this helps!

5 0
2 years ago
Question 1
Nastasia [14]

Answer:

1 zillionaire rbdgdhdndimoobenh

6 0
3 years ago
Thickness measurements of ancient prehistoric Native American pot shards discovered in a Hopi village are approximately normally
storchak [24]

Answer:

a) 0.1587

b) 0.0475

c) 0.7938

Step-by-step explanation:

Let's start defining our random variable.

X : ''Thickness (in mm) of ancient prehistoric Native American pot shards discovered in a Hopi village''

X is modeled as a normal random variable.

X ~ N(μ,σ)

Where μ is the mean and σ is the standard deviation.

To calculate all the probabilities, we are going to normalize the random variable X.

We are going to call to the standard normal distribution ''Z''.

[(X - μ) / σ] ≅ Z

We normalize by subtracting the mean to X and then dividing by standard deviation.

We can find the values of probabilities for Z in a standard normal distribution table.

We are going to call Φ(A) to the normal standard cumulative distribution evaluated in a value ''A''

a)

P(X

P(ZΦ(-1) = 0.1587

b)

P(X>7)=P(\frac{X-4.5}{1.5}>\frac{7-4.5}{1.5})

P(Z>1.666)=1-P(Z\leq 1.666)=

1 - Φ(1.666) = 1 - 0.9525 = 0.0475

c)

P(3

P(-1 Φ(1.666) - Φ(-1) = 0.9525 - 0.1587 = 0.7938

8 0
3 years ago
Which function describes the arithmetic sequence shown?<br> 1,-2, -5, -8, -11, ...
antiseptic1488 [7]

Answer:

a(n)=1+(n-1)(-3)

Step-by-step explanation:

Notice there's a common difference of d=-3.

If we use the formula a(n)=a1+(n-1)d to find the nth term given the first term and the common difference, we will see that the function that describes the arithmetic sequence as a(n)=1+(n-1)(-3)

6 0
2 years ago
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