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miss Akunina [59]
3 years ago
13

Which expression is equivalent to -1.3 - (-1.9)−1.3−(−1.9)minus, 1, point, 3, minus, left parenthesis, minus, 1, point, 9, right

parenthesis? Choose 1 answer: Choose 1 answer: (Choice A) A -1.3+(-1.9)−1.3+(−1.9)minus, 1, point, 3, plus, left parenthesis, minus, 1, point, 9, right parenthesis (Choice B) B -1.3+1.9−1.3+1.9minus, 1, point, 3, plus, 1, point, 9 (Choice C) C -1.9+1.3−1.9+1.3minus, 1, point, 9, plus, 1, point, 3 (Choice D) D 1.3+1.91.3+1.9
Mathematics
1 answer:
RideAnS [48]3 years ago
8 0

Answer:

Choise B: -1.3+1.9

Step-by-step explanation:

For this exercise you must remember the multiplication of signs:

(+)(+)=+\\(-)(-)=+\\(-)(+)=-\\(+)(-)=-

 

By definition, equivalent expression have the same value.

Then, you can find an equivalent expression to the expression provided in the exercise by simplifying it.

So, given:

-1.3 - (-1.9)

To simplify it, you can distribute the negative that is located outside of the parentheses (in order to eliminate the parentheses).

Applying this procedure, you get the following equivalent expression:

-1.3 - (-1.9)=-1.3+1.9

Therefore, as you can notice, the expression obtained matches with the one shown in Choice B.

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Answer:

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The football team has a total of 50 jerseys. There are 10 ​medium-sized jerseys. What percent of the jerseys are​ medium-sized j
mrs_skeptik [129]

Answer:

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lianna [129]

Answer:

(1) 2π - x² = 0 (2) x = 2.5 cm (3) perimeter = 10 cm

Step-by-step explanation:

(1)The area of the circular coin without the inner square removed is πr² where r = 3 cm is the radius of the coin. So, the area of the coin without the inner square removed is πr² = π(3 cm)² = 9π cm²

The area of the square of x sides removed from its center is x².

The area A of the each face of the coin is thus A = 9π - x²

Since the area of each face of the coin A = 7π cm²,

then

7π = 9π - x²

9π - 7π - x² = 0

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(2) Solve the equation 2π - x² = 0

2π - x² = 0

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x = ±√(2π)

x = ± 2.51 cm

Since x cannot be negative, we take the positive answer.

So, x = 2.51 cm

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(3) Find the perimeter of the square

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8 0
3 years ago
3.305 + 1.7 what's the sum? Also more questions are coming just doing a test
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  3.305

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Line up the decimal points and add like you usually would add.

5.005 is the answer.

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