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ZanzabumX [31]
3 years ago
9

Freddy is searching for a shirt and discovers that he has 12 shirts for every 6 pairs of jeans. If he has 18 shirts, how many pa

irs of jeans does he have
Mathematics
1 answer:
Ann [662]3 years ago
5 0

Answer:

9 jeans

Step-by-step explanation:

9 jeans 2 shirt per jean and 18 divided by 2=9

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I just need help with three, four, and seven. Solve the system of linear equations, and determine if the equation has one soluti
likoan [24]

3. If y=5x+9 and y=3x-2, then

5x+9=3x-2\implies2x+9=-2\implies2x=-11\implies x=-\dfrac{11}2

Then

y=5\left(-\dfrac{11}2\right)+9=-\dfrac{55}2+9=-\dfrac{37}2

(only one solution)

4. If y+2=4x, then y=4x-2. So we're told that 4x-5=4x-2 but this is impossible, because that would that for any x, we have -5 = -2. This is false, so this system has no solution.

7. "y is 6 less than 3 times x" means y=3x-6. "x is 2 more than one-third of y" means x=\dfrac13y+2. Solving the second equation for y gives y=3x-2, which would mean 3x-6=3x-2. But for the same reason as in (4), there is no solution. For any value of x, this equation gives the false conclusion that -6 = -2.

8 0
3 years ago
Solve 2x2 + 4x = 30 using the Quadratic Formula.
Maslowich

Answer:

x=-5, 3

General Formulas and Concepts:

<u>Pre-Algebra</u>

  • Order of Operations: BPEMDAS

<u>Algebra I</u>

  • Standard Form: ax² + bx + c = 0
  • Quadratic Formula: x=\frac{-b\pm\sqrt{b^2-4ac} }{2a}

Step-by-step explanation:

<u>Step 1: Define equation</u>

2x² + 4x = 30

<u>Step 2: Rewrite into Standard Form</u>

2x² + 4x - 30 = 0

<u>Step 3: Define variables</u>

a = 2

b = 4

c = -30

<u>Step 4: Solve for </u><em><u>x</u></em>

  1. Substitute:                    x=\frac{-4\pm\sqrt{4^2-4(2)(-30)} }{2(2)}
  2. Evaluate:                       x=\frac{-4\pm\sqrt{16-4(2)(-30)} }{2(2)}
  3. Multiply:                        x=\frac{-4\pm\sqrt{16+240} }4}
  4. Add:                              x=\frac{-4\pm\sqrt{256} }4}
  5. Evaluate:                      x=\frac{-4\pm16 }4}
  6. Factor:                          x=\frac{4(-1\pm4)}4}
  7. Divide:                          x=(-1\pm4)
  8. Add/Subtract:              x=-5, 3

And we have our final answer!

6 0
3 years ago
A spinner is divided into four equal sections that are numbered 2, 3, 5, and 6. The spinner is spun twice.
frez [133]
As the spinner is spun twice the order pairs which have a product less than 14 and contain at least one odd number are ( 2,3), ( 2,5), ( 3,2), ( 3,3), ( 5,2) 
= 5 order pairs
Option B is correct

Note: see the attached image to comprehend how we find order pair( for beginner   
<span />

6 0
3 years ago
Solving Equations by Dividing 2) 9x= -135 Solve for x. 0 -144 O 126 O 15 0 -15<br>​
luda_lava [24]
X = 15
Explanation:
9x = -135
Divide by 9 on both sides
X = -15
It is -15 since 135 is negative
7 0
3 years ago
Read 2 more answers
Y=x+8<br> Y=-4x-12<br> Solve each system by substitution
iVinArrow [24]

Answer:

Step-by-step explanation:

hello :

Y=x+8

Y=-4x-12

-4x-12 = x+8

-5x = 20

x = -4

but : y=x+8

so : y=-4+8 = 4

6 0
3 years ago
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