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maks197457 [2]
4 years ago
6

Can someone help with this I don’t understand

Mathematics
1 answer:
Karo-lina-s [1.5K]4 years ago
3 0

Answer: see below

Step-by-step explanation:

3x-12=7x+8 ⇔ given

   -12=4x+8 ⇔ addition property of equality

   -20=4x ⇔ subtraction property of equality

      x=-5 ⇔ division property of equality

-----------------------

5(x-1)=4x+13 ⇔ given

5x-5=4x+13 ⇔ distributive property

 x-5=13 ⇔ subtraction property of equality

    x=18 ⇔ addition property of equality

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Estimate the value of 12.2+2.8-9.5 by rounding off each number to the nearest integer.​
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15.0

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Answer:

Step-by-step explanation:

First,You have to realize that if you multiply the amount of food by something, you multiply the amount of calories.  if some piece of food is 100 calories what happens if you eat 2?  you get 2 times that number of calories.  Same fi you eat half of one of that kind of food.  You get half the amount of calories.

Here he makes 1 1/2 (one and a half) times the amount.  Now, if this is confusing  you just need to realize that  multiplying by this is the same as multiplying by 1+1/2.  Say, again, a piece of food is 100 calories.  Multiplying it by this would look like the following.

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