2x-1+9x+3=57 solve for X

Answer:

$42.49

Step-by-step explanation:

This means the cost of the item to you is $42.49. You will pay $42.49 for a item with original price of $49.99 when discounted 15%. In this example, if you buy an item at $49.99 with 15% discount, you will pay 49.99 - 7.4985 = 42.49 dollars.

Answer:

42.49

Step-by-step explanation:

Discount = 15% of 49.99

              = 0.15 * 49.99

              = 7.4985

Cost after discount = 49. 99 - 7.4985

                               = 42.4915

                               = 42.49

Answer:

i think its D I have stood here and looked at it for 5 minutes

Step-by-step explanation:

Answer:

He did not use the largest perfect square

Step-by-step explanation:

4      [tex]\sqrt{8}[/tex] is the correct answer

What is square root ?

In mathematics, a square root of a number x is a number y such that y² = x; in other words, a number y whose square is x. For example, 4 and −4 are square roots of 16, because 4² = ² = 16. The square root of any number can be expressed using the formula: √y = y½. In other words, if a number has 1/2 as its exponent, it means we need to find the square root of the number.

Given,

[tex]\sqrt{128}[/tex]

we divide the number 128 by 2 four times, we get

= [tex]\sqrt{8*2*2*2*2}[/tex]

= 2*2[tex]\sqrt{8}[/tex]

=4      [tex]\sqrt{8}[/tex]

Therefore, 4      [tex]\sqrt{8}[/tex] is the correct answer

Read more about square root at:

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Answer:

x= -2

Step-by-step explanation:

Answer:

X = -2

Step-by-step explanation:

Answer:

m<1 = 39

m<2 = 51

Step-by-step explanation:

For this problem, you need to understand that a little square in the bottom of two connecting lines represents a right-angle (an angle this 90 degrees).  This problem, gives you two relationships for angle 1 and angle 2 within a right-angle.  Using this information, we can solve for the measures of the two angles.

Let's write the two relations:

m< 1 = 3x

m< 2 = x + 38

And now let's right an equation that represents the two angles to the picture:

m<1 + m<2 = 90

Using this information, let's substitute the expressions we have for the two angles and solve for x.  Once we have the value of x, we can find the measure of the two angles.

m< 1 + m< 2 = 90

(3x) + (x + 38) = 90

3x + x + 38 = 90

x ( 3 + 1 ) + 38 = 90

x ( 4 ) + 38 = 90

4x + 38 = 90

4x + 38 - 38 = 90 - 38

4x = 90 - 38

4x = 52

4x * (1/4) = 52 * (1/4)

x = 52 * (1/4)

x = 13

Now that we have the value of x, we simply plug it back into our expressions for the m<1 and m<2.

m<1 = 3x = 3(13) = 39

m<2 = x + 38 = 13 + 38 = 51

And we can verify this is correct with the relational equation:

m<1 + m<2 = 90

39 + 51 ?= 90

90 == 90

Hence, we have found the values of m<1 and m<2.

Cheers.

Answer:

D. [tex] y - 5= 3(x - 1) [/tex]

B. [tex] y = \frac{3}{2}x - 3 [/tex]

Step-by-step explanation:

Problem 1:

Point-slope form equation is given as [tex] y - y_1 = m(x - x_1) [/tex], where, (x1, y1) is a point on the line, and m = slope.

Find the slope of the line of the graph given, using 2 points on the line, points (0, 2) and (1, 5).

[tex] m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{2 - 5}{0 - 1} = \frac{-3}{-1} = 3 [/tex]

Substitute (x1, y1) = (1, 5) and m = 3 into [tex] y - y_1 = m(x - x_1) [/tex]

[tex] y - 5= 3(x - 1) [/tex]

The answer is D.

Problem 2:

Slope-intercept equation takes the form: [tex] y = mx + b [/tex], where, m = slope, and b = y-intercept.

Find m and b.

Given, points (−4,−9) and (−2,−6),

[tex] slope(m) = \frac{y_2 - y_1}{x_2 - x_1} = \frac{-6 -(-9)}{-2 -(-4)} = \frac{3}{2} = \frac{3}{2} [/tex]

Substitute x = -2, y = -6, and m = ³/2 into [tex] y = mx + b [/tex], to find b:

[tex] -6 = \frac{3}{2}(-2) + b [/tex],

Subtract b from both sides

[tex] -6 = -3 + b [/tex]

Add 3 to both sides

[tex] -6 + 3 = b [/tex]

[tex] -3 = b [/tex]

[tex] b = -3 [/tex]

Substitute m = ³/2, b = -3 into [tex] y = mx + b [/tex]

[tex] y = \frac{3}{2}x + (-3) [/tex]

[tex] y = \frac{3}{2}x - 3 [/tex]

The answer is B.

Answer:

[tex] s \ge 40 [/tex]

Step-by-step explanation:

Let s = speed.

If the minimum speed is 40 mph, then the speed can be 40 mph or greater.

[tex] s \ge 40 [/tex]

Answer:

A.

vertical change to the horizontal change between any two points on the line.

Step-by-step explanation:

slope is the ratio of the vertical and horizontal changes between two points on a surface or a line. The vertical change between two points is called the rise, and the horizontal change is called the run. The slope equals the rise divided by the run: . This simple equation is called the slope formula.

The slope of a line is the ratio of the : A.  Vertical change to the horizontal change between any two points on the line.

The slope of a line is the gradient of a line and it describes (represents) both the direction and steepness of an equation of a straight line.

Mathematically, the slope of a line is calculated by using this formula;

[tex]Slope. \;m = \frac{Change \; in \; y \;axis}{Change \; in \; x \;axis} \\\\Slope. \;m = \frac{y_2 - y_1}{x_2 - x_1}[/tex]

Hence, the slope of a line is the ratio of the change in y-axis (vertical) to the change in x-axis (horizontal) of a line.

Additionally, the standard form of an equation of line is given by the following formula;

[tex]y = mx + b[/tex]

Where:

In conclusion, the ratio of the  vertical change to the horizontal change between any two points on the line is the slope of a line.

Read more: https://brainly.com/question/18123312

Answer:

Step-by-step explanation:

Slope is 6/1

Answer:

8 miles

Step-by-step explanation:

If Karen ran 4 miles and walked 5 the fraction for that is 4/5 and if you double both of those you get 8/10 we know that she walked 10 miles so she had to have run 8 miles.

Answer:

8

Step-by-step explanation:

Answer:  x = -7

Step-by-step explanation:

x = -7 will be a vertical line passing through all y values, and perpendicular to y = 5

The attached graph shows the lines and the point.

Answer:

It is 10. I usually have brain farts in math too.

Step-by-step explanation:

Answer:

is 13

Step-by-step explanation:

Answer: As well as very large numbers, standard form also deals with very small numbers: 4.56 x 10-3 is 4.56 ÷ 1000 = 0.00456.

Step-by-step explanation:

Answer:

x=1.6

Step-by-step explanation:

Answer:

8, -6

Step-by-step explanation:

Answer:

I think the answer is A from what I remember.

Step-by-step explanation:

the polynomial should be put in order based on the number in its power. it could not be added or subtracted if the power is not the same.

Answer:

Greater than 8 because you are multiplying by a number greater than 1.

Step-by-step explanation:

When 8 is multiple by another number, say x, the product is;

I) less than 8 if x<1

ii) equal to 8 if x=1

iii) greater than 8 if x> 1

Since 213 is greater than 1,then the product of 8 × 2 1 3 is greater than 8.

Answer:

yes it is true

hope my answer help you

Answer:

its in order from 2 to 3

Step-by-step explanation:

Answer:

See below

Step-by-step explanation:

Answer:

80

Step-by-step explanation:

If in 12 hours 20 inches falls in 24 hours 40 inches will fall and another 12 hours would be 60 inches. And another 12 hours you will get 2 days so your answer is 80

Answer:

Graph B is not a function, because the graph intersects the vertical  line more than one.

Step-by-step explanation:

Answer:

Step-by-step explanation:

The opposite of :-

-4=4

1= -1

-2.5= 2.5

101 = -101

1/2= -1/2

Answer:

Alright, so we got k + 9k = 8k - 6.

This means that 10k = 8k - 6.

As a result, we have 2k = -6, and k = - 6/2 = -3

So, k = -3 :)

Answer:

1. interior angles

2. complementary angles

3. supplementary

4. supplementary

5. Alternate interior angles

6. supplementary

7. supplementary

Step-by-step explanation:

HOPE THIS HELP DA!!!!!!!

Answer:

30 units

Step-by-step explanation:

PT=TQ

3x+9=5x-5

3x-5x=-5-9

-2x=-14

x=7

Putting value of x in PT above

PT=3x+9=3x7+9

PT=30 units