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2 years ago

-2.3x + 4.2x = 15.01 Solve for x

Mathematics

2 answers:

Neko [114]2 years ago

6 0

-2.3x + 4.2x = 15.01 original equation

1.9x = 15.01 combine like terms

1.9x/1.9 = 15.01/1.9 divide both sides by 1.9 to get x alone

x = 7.9 simplify

CHECK YOUR WORK:

plug in the solution to x into the original equation like so:

-2.3(7.9) + 4.2(7.9) = 15.01 original equation w/ substitute for x

-18.17 + 33.18 = 15.01 simplify multiplication

15.01 = 15.01 simplify addition

When you get an answer like this, you know that the solution to x that you found is correct.

VashaNatasha [74]2 years ago

4 0

Answer:

x = 7.9

Step-by-step explanation:

-2.3x + 4.2x = 15.01

combine like terms

1.9x = 15.01

divide both sides by 1.9

x = 7.9

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PIT_PIT [208]

Answer:

I believe its 33.60 because if you add up 33.+5% that would give you 33.6 so its 33.60

Step-by-step explanation:

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3 years ago

Which of the following is the weakest r-squared value? Which one is the strongest?

Setler [38]

Answer:

Weakest value = 0.0196

Strongest value = 0.5929

Step-by-step explanation:

Given:

Choices

0.691

-0.14

-0.24

-0.77

Computation:

0.691² = 0.477481

-0.14² = 0.0196

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2 years ago

1. What is the solution of n² – 49 = 0? (1 point)

maks197457 [2]

Answer:

1. $n=\pm7$

2. $x=\pm7i[tex]3.[tex]\pm 12x =a$

4. 22

Step-by-step explanation:

1. $n^2 - 49 = 0$

$n^2 =49$

$n= \sqrt{49}$

$n=\pm7$

2. $x^2+64 = 0$

$x^2 =-64$

$x= \sqrt{49}$

$x=\pm7i[tex]3. Area of square = [tex]a^{2}$

Where a is the side

We are given an area o square = $144x^{2}$

So, $144x^{2}=a^{2}$

$\sqrt{144x^{2}}=a$

$\pm 12x =a$

4. We are given that the solution of quadratic equation -9 and 9

So, equation becomes:

$(x+9)(x-9)=0$

$x^2- 81=0$

So, in the given equation $x^2 + z = 103$

z should be the number from which if we subtract 103 so we get 81

Substitute z = 22

$x^2 + 22 = 103$

$x^2 + 22 -103=0$

$x^2 -81=0$

Thus the value of z is 22

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