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ankoles [38]
3 years ago
13

Susan solved 200-91 and decided to add her answer to 91 to check her work explain why this strategy works

Mathematics
2 answers:
Veronika [31]3 years ago
5 0

Answer:

Property of additive inverse

Step-by-step explanation:

The additive inverse of a number a is -a as:

a + (-a) = 0 = (-a) + a

So, Susan tried to add the additive inverse of her subtrahend 91.

Let's see how it works:

(200-91) + 91 = 200 + (-91 + 91)    (associative property of addition)

= 200 + 0   (additive inverse property)

= 200, the original number.

Hence, her check is correct.

zhuklara [117]3 years ago
3 0
This strategy works because if you subtract one number from another the sum of the two numbers should be the that is being subtracted from. (In this case, it's 200)
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Your answer must be simplified.<br><br> −3 &lt; x -10
andrew11 [14]

Answer:

7 < x

Step-by-step explanation:

−3 < x -10

Add 10 to each side

−3+10 < x -10+10

7 < x

7 0
3 years ago
Determine the equation of the line that is parallel to y=23x+4 and passes through the point (3,7).
Licemer1 [7]

Answer:  y = 23x - 62

<u>Step-by-step explanation:</u>

Parallel lines have the same slope.

y = 23x + 4

  m=23   b=4

Input x = 3, y = 7, & m = 23 into the Point-Slope formula to find the equation or the Slope-Intercept formula to find b (you already have m).  I will choose the latter.

 y = mx + b

 7 = 23(3) + b

 7 = 69 + b

-62 = b

m = 23, b = -62  -->  y = 23x - 62

6 0
3 years ago
At a height of about 212 m one shell square is the tallest building in New Orleans Marley is creating a scale model of this buil
slega [8]

<u>Answer:</u>

0.8 meters

<u>Step-by-step explanation:</u>

We know that One Shell Square is the tallest building in New Orleans with a height of about 212 meters and Marlie is creating a scale model of this building, using the scale 250 meters : 1 meter.

So to find the height of the scale model, we can simply use the ratio method.

\frac{212 m}{250m} =\frac{x}{1}

x=\frac{212}{250} = 0.848

Therefore, the height of the scale model to the nearest tenth of a meter will be 0.8 meters.

8 0
3 years ago
A scale has a percent error of 7%. The scale reads the mass of a book as 450 g.
Hatshy [7]
500 grams I think it probably will be wrong but worth a try
7 0
3 years ago
Read 2 more answers
-5+ 3= 2) -7 -4 3) 122 × (-9) 4) -6 divided by 3/4
lutik1710 [3]

Answer:

Step-by-step explanation:

1) -5 +3 = -2

When two numbers are in different sign, subtract and the result will have the bigger numbers sign.  The bigger number is 5. so the result is (-2)

2) -7 - 2 = -9

When two numbers have same sign, add and the result will have the common sign

3) 122 * (-9) = - 1098

4) -6 ÷ (3/4)

=(-6)*\frac{4}{3}\\\\=-2*4

= -8

4 0
4 years ago
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