Destinyyyy
  • Destinyyyy
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Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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Destinyyyy
  • Destinyyyy
Solve. An investment is worth $3486 in 1995. By 2000 it has grown to $6441. Let y be the value of the investment in the year x, where x = 0 represents 1995. Write a linear equation that models the value of the investment in the year x.
Destinyyyy
  • Destinyyyy
@jim_thompson5910
jim_thompson5910
  • jim_thompson5910
`x = 0 represents 1995` in the year 2000, what is x?

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Destinyyyy
  • Destinyyyy
x is 5
jim_thompson5910
  • jim_thompson5910
yes
jim_thompson5910
  • jim_thompson5910
`An investment is worth $3486 in 1995` x = 0 and y = 3486 the point (0,3486) is on the graph
jim_thompson5910
  • jim_thompson5910
`By 2000 it has grown to $6441` the point (5,6441) is on the graph
jim_thompson5910
  • jim_thompson5910
use the slope formula to find the slope through (0,3486) and (5,6441).
Destinyyyy
  • Destinyyyy
Okay.
Destinyyyy
  • Destinyyyy
591
jim_thompson5910
  • jim_thompson5910
yes
jim_thompson5910
  • jim_thompson5910
m = 591 is the slope b = 3486 since we know (0,3486) is on the graph
jim_thompson5910
  • jim_thompson5910
plug those into y = mx+b
Destinyyyy
  • Destinyyyy
The equation is y=591x+3486
jim_thompson5910
  • jim_thompson5910
yes
Destinyyyy
  • Destinyyyy
Okay. One more.
Destinyyyy
  • Destinyyyy
38. Find the domain of the indicated combined function. Find the domain of (fg)(x) when f(x) = square root 5x+8 and g(x) = .square root 7x-9
Destinyyyy
  • Destinyyyy
Ive never done a problem like this with square root so im not sure where to start
Destinyyyy
  • Destinyyyy
Normally id plug them in next to each other and multiple.
jim_thompson5910
  • jim_thompson5910
first solve 5x+8 >= 0 for x
Destinyyyy
  • Destinyyyy
x>/ -8/5
jim_thompson5910
  • jim_thompson5910
type `>=` to mean "greater than or equal to"
jim_thompson5910
  • jim_thompson5910
I agree, it's `x >= -8/5`
jim_thompson5910
  • jim_thompson5910
now solve `7x-9 > 0` for x
Destinyyyy
  • Destinyyyy
9/7
jim_thompson5910
  • jim_thompson5910
there is NO underline because we don't want 7x-9 to be 0
jim_thompson5910
  • jim_thompson5910
`x > 9/7` I think you mean
jim_thompson5910
  • jim_thompson5910
plot `x >= -8/5` and `x > 9/7` on the same number line then shade the region where they both overlap
Destinyyyy
  • Destinyyyy
Yes.
Destinyyyy
  • Destinyyyy
The domain is [9/7 , infinity)
jim_thompson5910
  • jim_thompson5910
if x = 9/7, then the denominator would be 0. But we cannot divide by 0
Destinyyyy
  • Destinyyyy
Um okay..
jim_thompson5910
  • jim_thompson5910
so we have to kick out 9/7 from the domain
Destinyyyy
  • Destinyyyy
[0,infinity)
jim_thompson5910
  • jim_thompson5910
you were on the right track, just change the `[` to `(`
jim_thompson5910
  • jim_thompson5910
Domain: `(9/7, infinity)`
Destinyyyy
  • Destinyyyy
I only have options of- [9/7, infinity) [0,infinity)
jim_thompson5910
  • jim_thompson5910
hmm so strange. That has to be a typo because 9/7 isn't part of the domain
jim_thompson5910
  • jim_thompson5910
oh wait, it's (fg)(x) and not (f/g)(x) so yeah 9/7 is allowed
Destinyyyy
  • Destinyyyy
Okay. Thank you.
jim_thompson5910
  • jim_thompson5910
no problem

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