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Marina86 [1]
3 years ago
8

Can someone please help me figure out how to solve for x?​

Mathematics
1 answer:
Anna007 [38]3 years ago
8 0

Answer:

x=30

Step-by-step explanation:

Both triangles in this figure are similar. Therefore, we can set up the following proportion:

\frac{21}{x}=\frac{14}{20}.

Cross-multiply to solve:

14x=21\cdot 20,\\x=\frac{21\cdot20}{14},\\x=\fbox{$30$}.

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EastWind [94]

Answer:

y = all real numbers

x = all real numbers

In set notation/interval notation;

y∈(-∞,∞)

x∈(-∞,∞)

Step-by-step explanation:

1. Background information

The process of elimination involves manipulating an equation such that when the equations in the system are added, one variable is eliminated. Then one can solve for the other variable, finally, one substitutes the answer back in to find the eliminated variable. Therefore solving the system of equations.

2. The given information

Given the system;

(1)    4x + 5y = 4

(2)    8x + 10y = 8

3. Solving

Multiply the first equation by (-2)

4x + 5x = 4

*-2           *-2

-8x - 10x = -8

Add the first and second equations.

   -8x - 10y = -8

+ ( 8x + 10y = 8 )

_____________

0

This means that y can be any real number, and hence x can be any real number.

4 0
3 years ago
How do we determine whether or not something is a function?
Dmitrij [34]

Answer:

Functions can only have one output

Step-by-step explanation:

If we have a function of x and we input 2 and output 3 and 5, it is not a function. If 1 and 2 both output only 7, they would both be a function. Multiple inputs can have the same output and they are functions, but one input can not have multiple outputs.

Hope this helps

5 0
3 years ago
Is this problem correct?
Strike441 [17]

Answer:

Yes that is correct. B is correct.

Step-by-step explanation:

When you plug 0 in for x, the result is 3.

When you plug 1 in for x, the result becomes 1.

The equation matches up correctly.

f(x) = -2x + 3

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3 years ago
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the probability of a certain baseball player hitting a foul ball is 1/4. how many foul balls would you expect her to hit after 8
Travka [436]
Probability is 1/4, so all you have to do is multiply 80 by 1/4, which equals 20. 

So, she will likely hit 20 foul balls. 
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3 years ago
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vesna_86 [32]

Answer:

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Step-by-step explanation:

8.12 x 2.4 = 19.488

8 0
3 years ago
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