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RideAnS [48]
3 years ago
14

What is the value of x in the equation 4x + 8y = 40, when y = 0.8?

Mathematics
1 answer:
nadya68 [22]3 years ago
6 0
4x+8y=40 \ |:4 \\\\ x+2y=10 \\\\ x+2*0.8=10 \\\\ x+1.6=10 \\\\ x=10-1.6 \\\\ \boxed{x= 8.4}
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Write each sum using summation notation.<br> 1+ 2 + 3 + 4 + ⋯ + 1000
AVprozaik [17]

Answer:

\sum_{k=1}^{1000} k

Step-by-step explanation:

You have to use the summation notation formula:

\sum_{k}^{n} f(k) = f(1) + f(2) +...+f(n)

where k is the starting number, n is the ending number and f(k) is the function or the expression to be added.

In this case, you have the sum of the integer numbers from 1 to 1000. Therefore, k=1 and n=1000.

Now, you have to obtain the function f(k) which is the representation of the expression needed to obtain the correct result of the sum.

f(k=1) = 1

f(k=2)=2

f(k=3)=3 ...

You can notice that the value of k corresponds to te value of f(k) therefore f(k) = k

Replacing the values of k, n and f(k) in the formula:

\sum_{k=1}^{1000} k = 1+2+3+4+...+1000

7 0
4 years ago
Can someone help me, i cant find the anwser
Aloiza [94]

The range of the given function is represented by  {-6,-4,2}.

<h3>Domain and Range</h3>

The domain of a function is the set of input values for which the function is real and defined. In the other words, when you define the domain, you are indicating for which values x the function is real and defined.

While the domain is related to the values ​​of x, the range is related to the possible values ​​of y that the function can have.

Here, you need to replace the given domain values in the equation: f(x)=x-4. The question gives that the domain is represented by: -2 ,0 ,2 .

Thus,

For x=-2, you have:

f(x)= x-4

f(x)= -2-4

f(x)= -6

For x=0, you have:

f(x)= 0-4

f(x)= 0-4

f(x)= -4

For x=2, you have:

f(x)= x-4

f(x)= 2-4

f(x)= -2

Therefore, the range of the given function is {-6,-4,2}

Learn more about the range here:

brainly.com/question/10197594

#SPJ1

5 0
2 years ago
There are 295 students in 6th grade at Central Middle School. Must take science. The maximum number of students in the class is
vesna_86 [32]
14 classes must be planned you get this by dividing 295 by 22 and you get 13.4 but you have to round up because we are talking about people
7 0
3 years ago
Find the difference (3-13x-7x^2)-(5x^2+ 12x-10)
Nikolay [14]
3 - 13x - 7x^2 - (5x^2 + 12x - 10)
Distributing the negative over the parentheses chamges the signs:-
= 3 - 13x - 7x^2 - 5x^2 - 12x + 10
adding like terms:-
= -12x^2 - 25x + 13  (answer).

Its B
8 0
3 years ago
33pt =__ qt __qt pliz. hurry
Valentin [98]
 <span>16.5 
1 pint(US) = 0.5 quarts (US)</span>
5 0
3 years ago
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