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ivann1987 [24]
4 years ago
10

-2x + 3y=-1 2x + 5y=25 elimination

Mathematics
1 answer:
Igoryamba4 years ago
7 0
<span>-2x + 3y=-1
 2x + 5y=25
------------------add
8y = 24
  y = 3

</span>-2x + 3y =-1 
-2x + 3(3) =-1 
<span>-2x + 9 = -1
-2x = -10
   x = 2

answer
x = 2 and y = 3 or (2,3)

</span>
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What is the decimal and percent of 5/20 please help me. thank u
Korvikt [17]
The percentage is 25, a trick you can use to find the percentage when you have a decimal is to move the decimal point two places to the right like if  you have .25 you move the decimal point two places to the right. another example is .38, you move the decimal point two places  to the RIGHT and get 38 which is the percentage :)
7 0
4 years ago
\\\\\\\-------!!!!!40 POINTS!!!!-----\\\\\\\\\
aleksandrvk [35]
Let's actually find the line of best fit...

m=(nΣyx-ΣyΣx)/(nΣx^2-ΣxΣx)

m=(11*836-130*55)/(11*385-3025)

m=2046/1210  

m=93/55

b=(Σy-93Σx/55)/n

b=(55Σy-93Σx)/(55n)

b=(7150-5115)/(55*11)

b=185/55, so the line of best fit is:

y=(93x+185)/55

A)  The approximate y-intercept (the value of y when x=0) is 185/55≈3.36.

Which means that those who do not practice at all will win about 3.36 times

B) y(13)=(93x+185)/55

y(13)≈25.34

So after 13 months of practice one would expect to win about 25.34 times.
3 0
4 years ago
(7 + 3) divided by (5 x -1)
Stolb23 [73]
It is 2x-1 that is your awnser
7 0
4 years ago
3053.63=πr^2h<br><br> what is h?
zhenek [66]

Answer:

h = 12

Step-by-step explanation:

3053.63=πr^2h

Let r=9 and approximate pi as 3.14

3053.63=3.14 ( 9)^2 h

3053.63=3.14*81*h

3053.63=254.34h

Divide each side by254.34

3053.63/254.34=254.34h/254.34

12=h

6 0
3 years ago
Read 2 more answers
Caleb and Sergio stacked boxes on a shelf. Caleb lifted 14 boxes and Sergio lifted 12 boxes. The boxes that Sergio lifted each w
Ierofanga [76]
If the weight of the boxes that Caleb lifted is equal to c, then each box that Sergio lifted weighed c + 10. The total number of pounds that Sergio lifted is equal to the product of the number of the boxes and the weight. That is,
                                12(c + 10)
Thus, the answer is letter C. 
6 0
3 years ago
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