1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Sonja [21]
3 years ago
8

What is X for? x+20=35-4x

Mathematics
2 answers:
avanturin [10]3 years ago
5 0

Answer: x=3

You first place the x's in one side and the non x's in the other. Remember DCI.

Then solve. You get x=3

Helen [10]3 years ago
4 0
X+4x=35-20. 5x=35-20. 5x=15. X=3
You might be interested in
In two or three sentences explain how you would solve for the real solutions of the following equation: please help asap!!
g100num [7]

the real solutions for the equation x^{3}=-64 are -

x=4,2+-2\sqrt{3i}

Step-by-step explanation:

   x^{3} = - 64

   x^{3} +64  = 0

   We can write 64 as  4^{3}

  x^{3} + 4^{3} = 0

  using the identity  ( x^{3}+y^{3} = (x+y)(x^{2} -xy+y^{2} ) )

we get,

  = (x+4) (x^{2} -x*4+4^{2} )

  = (x+4)(x^{2} -4x+16)    ....................(1)

 solving the quadratic equation  ,

   x^{2} -4x+16 =0

solutions of this quadratic equation can be obtained by

   x=-b +- \sqrt{b^{2}-4ac } /2a

let use y for factors

x=-(-4x)+-\sqrt{(-4x^{2} )-4*x^{2} *16}  / 2*x^{2}

x=4x+-\sqrt{16x^{2} -64x^{2} } /2x^{2}

x=4+-\sqrt{16-64}/2

x=4+-4\sqrt{3i} /2

<u />x=2+-2\sqrt{3i}    ..................(2)

from the equation 1 we have,

x-4=0

which gives solution x=4

and from equation 2 we got  x=2+-2\sqrt{3i}

so the real solutions for the equation x^{3}=-64 are -

x=4,2+-2\sqrt{3i}

3 0
2 years ago
A school bought pens, each costing $1, and pencils, each costing $0.5. The cost of the whole purchase was $220. How many pens an
Mkey [24]

Answer:

  • <u>120 pens and 200 pencils.</u>

<u></u>

Explanation:

You can set a system of two equations.

<u>1. Variables</u>

<u />

  • x: number of pens
  • y: number of pencils

<u>2. Cost</u>

  • <em>each pen costs</em> $1, then x pens costs: x
  • <em>each pencil costs</em> $0.5, then y pencil costs: 0.5y

  • Then, the total cost is: x + 0.5y

  • The cost of the whole purchase was $ 220, then the first equation is:

          x + 0.5y = 220 ↔ equation (1)

<u>3. </u><em><u>There were 80 more pencils than pens</u></em>

Then:

  pencils  =      80   +   pens

       ↓                               ↓

       y        =      80   +      x        ↔ equation (2)

<u>4. Solve the system</u>

i) Substitute the equation (2) into the equation (1):

  • x + 0.5(80 + x) = 220

ii) Solve

  • x + 40 + 0.5x = 220
  • 1.5x = 180
  • x = 180/1.5
  • x = 120 pens

iii) Substitute x = 120 into the equation (2)

  • y = 80 + 120
  • y = 200 pencils

Solution: 120 pens and 200 pencils ← answer

6 0
3 years ago
A parallelogram has a base of 9 inches and a height of 11 inches. What is the area? ​
Margaret [11]
11 x 9 = 99

The area is 99 inches.
5 0
3 years ago
Read 2 more answers
Please really need help
zavuch27 [327]

Answer:

IDK

Step-by-step explanation:

IDK

6 0
3 years ago
(3.45 x 103) + (1.23 x 103)​
mr Goodwill [35]

Answer:

482

Step-by-step explanation:

!!!!!!!!!!!!!!!!!

6 0
3 years ago
Other questions:
  • Function f is a cosine function with period 8π, amplitude 3, and a local maximum at f(0) = –3. What is the equation of the midli
    11·2 answers
  • i live a mile away from the gas station, which takes about 10 minutes to get there and back. My dad went to the gas station and
    5·1 answer
  • 1/5 times 26 estimated
    15·2 answers
  • <img src="https://tex.z-dn.net/?f=48948%20%5Ctimes%20729555" id="TexFormula1" title="48948 \times 729555" alt="48948 \times 7295
    9·2 answers
  • To find out how fast a tree grows, you can measure its trunk. A giant red oak's diameter was 248 inches in 1965. The tree's diam
    13·2 answers
  • An acute angle θ is in a right triangle with sin θ = seven eighths. What is the value of cot θ?
    9·1 answer
  • The cost of putting in automatic sprinklers for a lawn largely depends upon the length of Poole that must be laid. The controlle
    14·1 answer
  • Please<br> help 20 points
    15·1 answer
  • Helppppp !!!!!! <br><br>5 ( 3a - 9 ) = ? ​
    10·2 answers
  • How to solve the following system y=(1/2)x^2+2x-1 and 3x-y=1
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!