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blsea [12.9K]
3 years ago
14

Which expression is equivalent to (3b + 2r) + (4b + r)?

Mathematics
2 answers:
marysya [2.9K]3 years ago
6 0
(3b+2r)+(4b+r)=3b+4b+2r+r=7b+3r. B. 7b+3r
lozanna [386]3 years ago
4 0
To do this problem, you need to first get rid of all the parenthesis. Since all the operations are addition (+), remember the <span>Associative Property of Addition. This property says when you're adding, it doesn't matter where you put the parentheses because it'll all add up to the same thing.

That means </span>(3b + 2r) + (4b + r) = (3b + 4b) + (2r + r), or even, just get rid of the paratheses in general and have (3b + 2r) + (4b + r) = (3b + 2r + 4b + r).

Either way, now you can add like terms so: 
(3b + 2r) + (4b + r) = (3b + 4b) + (2r + r) = 7b + 3r

Your answer is B) <span>7b + 3r</span>
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What is the determinant of the coefficient matrix of the system {4x+3y+2z=0 -3x+y+5z=0 -x-4y+3z=0
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Answer:

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Step-by-step explanation:

You want the determinant of the matrix ...

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One way to figure it is as the difference between the sum of products of the down-diagonals and the sum of products of the up-diagonals:

  D = (4)(1)(3) +(3)(5)(-1) +(2)(-3)(-4) -(-1)(1)(2) -(-4)(5)(4) -(3)(-3)(3)

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The determinant of the coefficient matrix is 130.

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Many scientific and graphing calculators and web sites can perform this calculation for you.

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3 years ago
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Step-by-step explanation:

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Height of prism = 7 inches

Step-by-step explanation:

Let h be the height of prism.

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Look at the following math problem. 7 × 10 = 70 In this problem, you're multiplying 7 by 10. What is 10 called in this math prob
umka2103 [35]
For this case we have the following expression:
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