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olga55 [171]
2 years ago
7

Brainiest to whoever correct

Mathematics
1 answer:
LuckyWell [14K]2 years ago
7 0

Answer: 2nd one.

Step-by-step explanation:

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3 years ago
7x-y=19 2x-3y=19 solve by elimination​
avanturin [10]

Answer:

x=2 y=-5

Step-by-step explanation:

7x-y=19

2x-3y=19

Multiply the first equation by -3

-3(7x-y)=19*-3

-21x +3y =-57

Add this to the second equation to eliminate y

-21x +3y =-57

2x-3y=19

-----------------------

-19x = -38

Divide by -19

-19x/-19 = -38/-19

x = 2

Now we need to find y

7x-y = 19

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14 -y =19

Subtract 14 from each side

14-14 -y=19-14

-y=5

Multiply by -1

y = -5

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3 years ago
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ludmilkaskok [199]
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3 years ago
F(x) = sin(x^2 - 2)<br> find points of discontinuity, if any ...?
Hoochie [10]
Function sin(x) is defined for all real numbers.
Function x^2-2 is a parabola which is defined for all real numbers.

Therefore, function f(x) = sin(x^2 - 2) has no <span>points of discontinuity.</span>
6 0
4 years ago
Natasha and Rodrigo are in a class of 30 students that selects 4 leaders. How many ways are there to select the 4 leaders so tha
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There are 20853 ways are there to select the 4 leaders so that either Natasha and Rodrigo are both selected or Natasha and Rodrigo are both not selected.

<h3>What is combination?</h3>

A combination is a mathematical technique that determines the number of possible arrangements in a collection of items.  

The number of the possible ways will be calculated by:

=2 ^{28}C_2+^{28}C_4

=\dfrac{28\times 27}{2}+\dfrac{28\times 27\times 26\times 25}{4\times 3\times 2}

=756+28853

=21231

Hence there are 20853 ways are there to select the 4 leaders so that either Natasha and Rodrigo are both selected or Natasha and Rodrigo are both not selected.

To know more about Combination follow

brainly.com/question/11732255

#SPJ1

8 0
2 years ago
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