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Radda [10]
4 years ago
15

If you triple a number and add 11 you get 200 what is the number

Mathematics
2 answers:
Dafna1 [17]4 years ago
8 0
You can set up a simple algebraic equivalent to find a number equivalent to 200 after being multiplied by 3 and added 11 to.

3x+11=200
3x=189
x=63

Had to edit! Realized what I had done wrong
Stella [2.4K]4 years ago
5 0
Well let's work backwards to find out! Okay so subtract 11 from 200 (because you added 11) then you got 189 know and then you would divide the number by 3 (because you tripled it) so 189÷3=63 so let's try it with 63.



63 tripped is 189, 11 added to 189 is 200

So know know that it works we know it's our answer. 63
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Answer:

a. y = 27.5 - 0.3X

b. 20

Step-by-step explanation:

y =  a + bX

usin the table in the attachment i added, we so for the regression equaion

n = 8

∑xy = 4460

∑x = 280

∑y = 136

∑x²= 10800

b=\frac{8(4460)-(280)(136)}{8(10800)-280^{2} } \\b=\frac{35680-38080}{86400-78400} \\b=\frac{-2400}{8000} \\b = -0.3

from here we solve for a

a= \frac{136-(-0.3)(280)}{8} \\a =\frac{136+84}{8} \\a=\frac{220}{8} \\a = 27.5

a. the estimated regression equation

y = 27.5 - 0.3X

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y = 27.5 - 0.3(25)

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