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Ymorist [56]
3 years ago
14

Help me plz I need help

Mathematics
2 answers:
e-lub [12.9K]3 years ago
4 0

I can see why you need help. I don't quite understand what the question is, but both options are factually correct

Alex_Xolod [135]3 years ago
3 0

Actually I didn’t understand what the question want

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Solve each system by the addition method.
bagirrra123 [75]

Answer:

(x, y) = (2, -1.5)

Step-by-step explanation:

x + 2y = -1

5x - 4y = 16

<=>

(2)x + (2)2y = (2)(-1)

5x - 4y = 16

<=>

2x + 4y = -2

5x - 4y = 16

<=>

7x = 14

<=>

x = 2

(*)x + 2y = -1

=> 2 + 2y = -1

=> 2y = -3

=> y = -1.5

=> (x, y) = (2, -1.5)

6 0
3 years ago
How much of 30% HCI and 45% HCI would be needed to mix and produce 50 liters of 35% HCI
VladimirAG [237]

Answer:

  • 33 1/3 liters of 30%
  • 16 2/3 liters of 45%

Step-by-step explanation:

Let x represent the liters of 45% solution needed. Then the amount of HCl in the mix is ...

  0.45x +0.30(50 -x) = 0.35(50)

  0.15x = 0.05(50) . . . . . simplify, subtract 0.30(50)

  x = (0.05/0.15)(50) = 50/3 = 16 2/3 . . . liters of 45% HCl

33  1/3 liters of 30% and 16 2/3 liters of 45% HCl are needed.

_____

<em>Comment on the solution</em>

You may notice that the general solution to a mixture problem of this sort is that the fraction of the mix that is the highest contributor is ...

  (mix % - low %) / (high % - low %) = (.35 -.30) / (.45 -.30) = .05/.15 = 1/3

5 0
3 years ago
A bird was sitting 8 meters from the base of an oak tree and flew 10 meters to reach the top of the tree. How tall is the tree?
alina1380 [7]
100=64-x^2
36=x^2
X=6 meters
5 0
2 years ago
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Line r cuts a pair of parallel lines. One of the eight angles created measures 90°. Which statements about the angles are true?
MrRa [10]

Answer:

Step-by-step explanation:

if two parallel lines are cut by a traversal, the alternate exterior angles are congruent. If two lines are cut by a traversal and the alternate exterior angles are congruent, the lines are parallel. Corresponding Angles: The name does not clearly describe the "location" of these angles

4 0
3 years ago
A dozen donuts cost $4.20. How much will 1 donut cost?
CaHeK987 [17]
$0.35 is the answer yea brainly forcing me to make it at least 20 characters.
5 0
3 years ago
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