Write the missing number that makes the equation true. 3+4=8-

The answer is 12 because you are using the commutative property.

Let's evaluate left side first.

There are 4 -5's and 5 -3's

So that's 4(-5) + 5(-3) = -35

So now our equation is -35 = -5x

Now divide both sides by -5:

-35 / -5 = x

7 = x

So the missing number would be 7 to make this equation true.

Final 7

Hope this helps.

I think it's number 2

Data:
missing number = x

Solving:


Put the numbers with incognito on the left and change the signal when changing sides if necessary, put the numbers without incognito on the right by changing the signal if necessary.




Replace found value and Confirm that the solution is correct:






The missing number to make the equation true is 

8-5=13-10
2=2(true)

So the number to make the equation true is 10

7

step-by-step:
okay so first you do 7*5 which is 35 and 20+8 which is 28

then you get 35=28+x (the x is the ‘missing number’)

to find x you subtract 28 from both sides to keep the equation balanced

35-28=28-28+x

so 35-28 is 7 and 28-28 is 0 so then you have 7=x and your answer is 7

you’re doing algebra but instead of using variables your teacher is saying find the ‘missing number’ haha

1.) Average = sum of data / number of data
Let the low temperature of Dec 17 be x, then (x + -8 + 1 + 10 - 1 + 7 + 4 + 6)/8 = 1.25
x + 19 = 1.25 x 8 = 10
x = 10 - 19 = -9
Therefore, the low temperature on 17 Dec is -9.

2.) -6+(-6)+(-6)+(-6)+[(-3)+(-3)+(-3)+(-3)+(-3)+(-3)] = -6 - 6 - 6 - 6 + [-3 -3 - 3 - 3 - 3 - 3] = -6 - 6 - 6 - 6 - 6 - 6 - 6 = (-6)(7)
The missing number is 7.

3.) (-4)(5) = (4)(-5) = -5+(-5)+(-5)+(-5)

4.) The number Loli is trying to evaluate is (-5)(3)

5.) The temperature drops by 5/10 = 0.5 degrees each day.
Let x be the day's starting temperature and y be the day's end temperature,
x - y = 0.5

6.) He looses 18/6 = 3 pounds of weight each week.
Let x be his weight at the start of the week and y be his weight at the end of the week, then
x - y = 3

7.) Jill is evaluating (-3)(4)

8.) Average = sum of data / number of data
Let the profit/los of 2008 be x, then
(-1.30 - 0.10 + 1.50 + 0.80 + 1.50 + x + 1.25 + 0.55)/8 = 0.3375
4.2 + x = 0.3375 x 8 = 2.7
x = 2.7 - 4.2 = -1.50
Therefore, the loss of 2008 is $-1.50

-6+(-6)+(-6)+(-6)+[(-4)+(-4)+(-4)+(-4)+(-4)+(-4)] = (-6)(x)

4(-6) + 6(-4) = -6x

-48 = -6x

8 = x

Final 8

The Answer is 3 + 4 = 8 - 1

The Answer is 3 + 4 = 8 - 1