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3 years ago

Simplify the following expression. (65x+50y)-(16x-21y)

Mathematics

2 answers:

GarryVolchara [31]3 years ago

5 0

Your going to want to first distribute the negative out to the second equation
65x+50y-16x+21y
49x+71y

Rzqust [24]3 years ago

5 0

81x-29y because you do 65x plus 16x because they both have the variable x at the end. now do 50y plus -21y and since it is a negetive (and it is a negetive it is not just a subtraction sign trust me i have done this many times before and been correct) you get 29 y because they both have the variable y in it. and you can't do anything with a two different variables.

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Number 7. Please asap.

love history [14]

7a)

$\frac{n(n - 3)}{2} = 665\\n(n - 3) = 665 \cdot 2\\n(n - 3) = 1330\\n^2 - 3n = 1330\\n^2 - 3n - 1330 = 0\\n = \frac{-(-3) \pm \sqrt{(-3)^2 - 4 \cdot 1 \cdot (-1330)}}{2 \cdot 1} = \frac{3 \pm \sqrt{9 + 5320}}{2} = \frac{3 \pm \sqrt{5329}}{2} = \frac{3 \pm 73}{2}\\n_1 = \frac{3 + 73}{2} = \frac{76}{2} = 38\\n_2 = \frac{3 - 73}{2} = \frac{-70}{2} = -35$

If n is the amount of sides then there's 38 sides in a polygon with 665 diagonals

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