anonymous
  • anonymous
will give medal Find the value of the expression 2x3 + 3y2 − 17 when x = 3 and y = 4. (5 points) 26 85 943 1,927
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
Okay so you need to substitute. You know how?
anonymous
  • anonymous
You just insert the x=? and the y=? in for the x's and y's in the equation.
anonymous
  • anonymous
2x3 +3y2 − 17 =2 *3*3 + 3*4*2-17 =25

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anonymous
  • anonymous
25 isn't even an answer up there
welshfella
  • welshfella
2x3 + 3y2 − 17 x = 3 y = 4 so we have 2(3)^3 + 3(4)^2 - 17 = 54 + 48 - 17
welshfella
  • welshfella
i've assumed that the numbers after the x an y are exponents
anonymous
  • anonymous
So the answer would be 85
welshfella
  • welshfella
yes
anonymous
  • anonymous
substitute the 3 for x and 4 for y and do the math it would come out to 85
anonymous
  • anonymous
I see now that makes total sense thank you so very much
welshfella
  • welshfella
yw
anonymous
  • anonymous
np
anonymous
  • anonymous
does any body know how to do this one If the length of side a is 12 centimeters, m∠B = 36°, and m∠C = 75°, what is the length of side b? Round your response to two decimal places.

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