7th grade math question?

[LuckyCards2006]

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[LuckyCards2006]

Man, I used to be good at math, can’t figure it out anymore


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[Shane]

No. 7x = 182. x = 26

[futureagg]

No. 7x = 182. x = 26

Correct add the Xs together then divide.


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[LuckyCards2006]

I’m still confused


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[J-III]

X+X+5X-2=180
X+X+5X=180+2
7X=182 divide both by 7
X=26

[LuckyCards2006]

And this one


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[LuckyCards2006]

Cmon math wizards!


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[Fig]

2x + 10 + 90= 180
2x + 100 = 180
2x = 80
X = 40

[COACH_EM_UP]

You have to combine the like terms before you can divide by the coefficient in the 1st problem.

In the 2nd problem, there is 2 ways to do it. You can take the x + x+10 and set it equal to 90 or you can set x+x+10+90 equal to 180 and solve. One extra step of addition if you solve the 2nd equation.

[Youngblood]

I’m putting my head on my desk now!


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[planomustang]

wow. these are so simple.

The sum of the interior angles of a triangle is always 180 degrees, in two dimensions. work from there.

I can also prove that the product space of two metric spaces is also a metric space. Assume not, then show that the assumption contradicts that the initial metric spaces are metric. QED

[marshman]

I’m still confused


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Your not alone

[STONE KILLER]

I’m so lost how I. The hell do you know what x is to begin with.


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[Shane]

I’m so lost how I. The hell do you know what x is to begin with.


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You don't know what x is to begin with. That's the point of it - to figure out what x is. In the first problem, we determined that x = 26. If all 3 angles of the triangle add up to 180 degrees (as they do in every triangle, no matter what it looks like), and the two narrow angles in that particular triangle are both x and the widest angle is 5x-2, then you can check to see if 26 is the correct answer......

x + x + 5x-2 = 180
26 + 26 + 5(26) - 2 = 180
52 + 130 - 2 = 180
182 - 2 = 180
180 = 180 TRUE, so 26 is the correct answer for that one