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
Ghella [55]
3 years ago
15

AdhkjAhkmhdj help me please

Mathematics
1 answer:
kirza4 [7]3 years ago
7 0
4x+2x=84
3x+5y=126
5x+4y=?
--------------------
cerco la x nella prima equazione:
4x+2y=84 
x=(84-2y)/4
x=(42-y)/2
-------------------------------------------------------------------------
cerco la y nella seconda equazione, sostituendo la x:
3x+5y=126
3[(42-y)/2]+5y=126
y= -18
------------------------------------------------------------------------
cerco la x della nella equazione, sostituendo la y:
4x+2y=84
4x+2(-18)=84
x=30
---------------------------------------------------------------------------------------------------
cerco i totale nella terza equazione, sostituendo i valori della x e della y:
5x+4y= ?
5*30 + 4*(-18)= 150-72 = 78

You might be interested in
A certain forum reported that in a survey of 2005 american adults, 27% said that they believe in astrology.
Nina [5.8K]

Answer:

               

Step-by-step explanation:

                 

8 0
2 years ago
1) A fast food restaurant had 13 pounds of flour. If they split the flour evenly among 3
Ganezh [65]

Answer:

Each chicken would use 4.33 pounds of flour. Two whole numbers the answers relies is 4 and 5.

Step-by-step explanation:

7 0
3 years ago
Read 2 more answers
Explain how the difference of a fraction or a rational number and its additive inverse is equal to zero.
Jobisdone [24]
This question is in reverse (in two ways): 

<span>1. The definition of an additive inverse of a number is precisely that which, when added to the number, will give a sum of zero. </span>

<span>The real problem, in certain fields, is usually to show that for all numbers in that field, there exists an additive inverse. </span>

<span>Therefore, if you tell me that you have a number, and its additive inverse, and you plan to add them together, then I can tell you in advance that the sum MUST be zero. </span>

<span>2. In your question, you use the word "difference", which does not work (unless the number is zero - 0 is an integer AND a rational number, and its additive inverse is -0 which is the same as 0 - the difference would be 0 - -0 = 0). </span>

<span>For example, given the number 3, and its additive inverse -3, if you add them, you get zero: </span>
<span>3 + (-3) = 0 </span>

<span>However, their "difference" will be 6 (or -6, depending which way you do the difference): </span>

<span>3 - (-3) = 6 </span>
<span>-3 - 3 = -6 </span>

<span>(because -3 is a number in the integers, then it has an additive inverse, also in the integers, of +3). </span>

<span>--- </span>

<span>A rational number is simply a number that can be expressed as the "ratio" of two integers. For example, the number 4/7 is the ratio of "four to seven". </span>

<span>It can be written as an endless decimal expansion </span>
<span>0.571428571428571428....(forever), but that does not change its nature, because it CAN be written as a ratio, it is "rational". </span>

<span>Integers are rational numbers as well (because you can always write 3/1, the ratio of 3 to 1, to express the integer we call "3") </span>

<span>The additive inverse of a rational number, written as a ratio, is found by simply flipping the sign of the numerator (top) </span>

<span>The additive inverse of 4/7 is -4/7 </span>

<span>and if you ADD those two numbers together, you get zero (as per the definition of "additive inverse") </span>

<span>(4/7) + (-4/7) = 0/7 = 0 </span>

<span>If you need to "prove" it, you begin by the existence of additive inverses in the integers. </span>
<span>ALL integers each have an additive inverse. </span>
<span>For example, the additive inverse of 4 is -4 </span>

<span>Next, show that this (in the integers) can be applied to the rationals in this manner: </span>

<span>(4/7) + (-4/7) = ? </span>
<span>common denominator, therefore you can factor out the denominator: </span>

<span>(4 + -4)/7 = ? </span>
<span>Inside the bracket is the sum of an integer with its additive inverse, therefore the sum is zero </span>
<span>(0)/7 = 0/7 = 0 </span>

<span>Since this is true for ALL integers, then it must also be true for ALL rational numbers.</span>
5 0
3 years ago
the pilgrims sailed aboard the mayflower to America in 1620.in 2040.how many years will have passed since the pilgrims sailed to
Bezzdna [24]

Subtract the year the pilgrims sailed from the year you want to find the distance from:

2040 - 1620 = 420 years.

4 0
2 years ago
Please help I need help on this thank you
Charra [1.4K]
IJ because I learned this
8 0
3 years ago
Other questions:
  • Jane moves from a house with 71 square feet of closet space to an apartment with 45.44 square feet of closet space. What is the
    13·1 answer
  • Which proportion could be used to find the length of side b?​
    12·2 answers
  • 12 people can be of 30 chairs in eight hours how many chairs candy people build in 100 hours
    15·1 answer
  • Willa says the slope of the graph is - 3. What error did
    11·1 answer
  • If 0 is in quadrant II and sin^2 0=3/4 evaluate tan0
    10·1 answer
  • Finished playing at park at 3:12 pm and played for 27 minutes what time start?
    12·2 answers
  • Can someone please answer these 2 questions.
    10·1 answer
  • I need help with this ​
    6·1 answer
  • Please help me please<br><img src="https://tex.z-dn.net/?f=%20%7Bx%7D%5E%7B2%7D%20%20%2B%205x%20%2B%204%20%5C%5C%20%20%5C%5C%20x
    9·2 answers
  • Triangle P R Q is shown. Angle R P Q is 39 degrees. The length of P R is 6, the length of R Q is p, and the length of P Q is 8.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!