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mihalych1998 [28]
3 years ago
11

Pre-Algebra Due urgently Tysm

Mathematics
2 answers:
Vesna [10]3 years ago
7 0

Answer:

1. x = 5    2. y = 4      3. x = -2

Step-by-step explanation:

2x - y = 9             -5x + 2y = 13       3x + 4y = -6

<u>4x + y = 21</u>            <u>5x + y = -1   </u>      <u> 7x(-1) + 4y(-1) = -14(-1)</u>   <(multiply all by -1)

<u>6x = 30 </u>                      <u>3y = 12</u>       <u>  -4x = 8</u>

6       6                        3       3          4       4

x = 5                            y = 4              x = -2

statuscvo [17]2 years ago
6 0
I don’t know the answer I just need points
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Pls help, I know the answer but what I wrote in the box isn't correct<br> How do I show the answer?
artcher [175]

Answer:

<em>AC=11.38 cm</em>

Step-by-step explanation:

<u>The Law of Cosines </u>

It relates the length of the sides of a triangle with one of its internal angles.

Let a,b, and c be the length of the sides of a given triangle, and x the included angle between sides a and b, then the following relation applies:

c^2=a^2+b^2-2ab\cos x

The figure shows two triangles and we are required to calculate the length of the side AC, knowing two sides and the angle between them. Thus, applying the formula:

AC^2=17^2+13^2-2*17*13*\cos42^\circ

AC^2=289+169-442*0.7431

AC^2=129.53

AC=\sqrt{129.53}

AC=11.38 cm

3 0
3 years ago
A museum groundskeeper is creating a semicircular statuary garden with a diameter of 36 feet. There will
mart [117]

Answer:

The fencing would cost a total of $961.33 rounded to the nearest hundredth

Step-by-step explanation:

Circumference: 2πr (r = 18 or 1/2 diameter)

2 × 3.14 × 18 = 113.097336

113.097336 × $8.50 = $961.327356, which rounds up to $961.33

3 0
3 years ago
1. Use the expression 10 x ? where? represents a factor between 1 and 9. What is true about the digit in the ones place of each
marishachu [46]

We want to study a general product, and find information about the ones place.

We will see that the ones place is always zero.

We have the expression:

10×?

Where ? can be any number between 1 and 9 (only whole ones)

What is true about the digit of the ones place (the first digit at the left of the decimal point) in each product?

Let's give ? some different values and see what happens:

10×1 = 10

10×2 = 20

10×3 = 30

etc...

We can see that the ones place will always be equal to zero.

If you want to learn more, you can read:

brainly.com/question/16552177

4 0
3 years ago
12. Determine the slope of the line having the equation 2x + y = 12
Virty [35]

Answer:

b. -2

Step-by-step explanation:

Note the slope-intercept form: y = mx + b

Note that:

y = (x , y)

m = slope

x = (x , y)

b = y-intercept

First, isolate the variable, y. Note the equal sign, what you do to one side, you do to the other. Subtract 2x from both sides of the equation:

2x (-2x) + y = (-2x) + 12

y = -2x + 12

Remember, m is the variable for the term that stands for the slope (directly next to the x variable). In this case, your answer will be -2

b. -2 is your answer.

~

4 0
3 years ago
Read 2 more answers
Find the equation of the inverse y=7x^3+2
topjm [15]
Y= cube root ((x-2)/7)
4 0
3 years ago
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