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astraxan [27]
3 years ago
14

Simplify the expression b - 7 + b - 8

Mathematics
1 answer:
natulia [17]3 years ago
3 0

Answer:

2b - 15

Step-by-step explanation:

b - 7 + b - 8  

You combined the two b's correctly, but didn't combine the two constants, -7 and -8.  

Those combine to   -7 + (-8)  = -7 - 8  = -15,  so the final answer is

2b - 15

you have -7 and are subtracting 8 more, so you are moving 8 units left on the number line, so it has to get more negative.

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(25 + 19) + 15 = (19 + 25) + 15<br><br><br> What property is that equation
malfutka [58]

Answer:

Commutative Property

Step-by-step explanation:

It looks like Associative property which is when you change the GROUP, but actually it’s commutative because it didn’t change any numbers in the group, just the order of where they were.

Associative: (25 + 19) + 15 = (15 + 19) + 25

Commutative: (25 + 19) + 15 = (19 + 25) + 15

It didn’t change the numbers, only the order. Therefore, it would be commutative property

8 0
2 years ago
Read 2 more answers
Write the linear equation in slope-intercept form and simplify.<br> –4x + 13y = 7
statuscvo [17]

\\ \sf\longmapsto -4x+13y=7

\\ \sf\longmapsto 13y=4x+7

\\ \sf\longmapsto y=\dfrac{4x+7}{13}

\\ \sf\longmapsto y=\dfrac{4}{13}x+\dfrac{7}{13}

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2 years ago
Someone help me with pre cal?
Aloiza [94]
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3 0
3 years ago
Circumference and Area of Circles
yanalaym [24]

Step-by-step explanation:

Area of a circle = #r^2

1256 = 3.14 × r^2

r^2 = 1256/3.14

r^2 = 400

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8 0
3 years ago
How many square feet of outdoor carpet will we need for this hole?
Mamont248 [21]

Answer:

The area of the outdoor carpet = 60 - 6 - 6 = 48 ft²

Step-by-step explanation:

The picture below is what you are referring to .

The whole area of the shape forms a rectangle. A triangle and a  rectangle has been cut off from the whole carpet rectangle. The square ft or area of the carpet is the subtraction of the area of the rectangle and triangle cut off from the whole area of the rectangle .

Area of the rectangle = Lb

where

L = 12 ft

b =  5 ft

area = 12 × 5  = 60 ft²

The cut off triangle area

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area = 1/2 × 4 × 3

area = 12/2 = 6 ft²

The cut off rectangle area

area = Lb

area = 3 × 2

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The area of the outdoor carpet = 60 - 6 - 6 = 48 ft²

7 0
3 years ago
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