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3 years ago

Add the two expressions. −2.4n−3 and −7.8n+2

Mathematics

2 answers:

BabaBlast [244]3 years ago

8 0

-10.2n-1 is the answer. You add like terms to get this. So, -2.4n+(-7.8n)=10.2n and -3+2=-1

meriva3 years ago

4 0

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Identify a and b in the binomial expression (2x3 + 3y2)7.

Shkiper50 [21]

$\text{Hey there!}$

$\text{Distribute the value of 7 in each of your terms}$

$\text{(2x}^3+\text{3y}^2)(7)$

$\text{2x}^3\times7=\text{14x}^3$

$\text{3y}^2\times7=\text{21y}^2$

$\text{We cannot combine like terms because they AREN'T any in this equation}$

$\boxed{\boxed{\bf{Answer:14x^3+21y^2}}}\checkmark$

$\text{Good luck on your assignment and enjoy your day!}$

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Nat2105 [25]

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3 years ago

For the equation 2(4+x)+(13+x)=3x+k which value of k will create an equation with no solutions. .A. x B. 3x .C 15 D. 21

Artist 52 [7]

<h3>Answer: choice C) 15</h3>

Simplify the left side to get

2(4+x)+(13+x)

2(4)+2(x) +13+x

8+2x+13+x

3x+21

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So the original equation

2(4+x)+(13+x) = 3x+k

turns into

3x+21 = 3x+k

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Subtract 3x from both sides

3x+21 = 3x+k

3x+21-3x = 3x+k-3x

21 = k

k = 21

-----------

If k = 21, then the original equation will have infinitely many solutions. This is because we will end up with 3x+21 on both sides, leading to 0 = 0 after getting everything to one side. This is a true equation no matter what x happens to be.

If k is some fixed number other than 21, then there will be no solutions. This equation is inconsistent (one side says one thing, the other side says something different). If k = 15, then

3x+21 = 3x+k

3x+21 = 3x+15

21 = 15 .... subtract 3x from both sides

The last equation is false, so there are no solutions here.

note: if you replace k with a variable term, then there will be exactly one solution.

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3 years ago

$44 is 55% of what dollar amount?

melomori [17]

Answer:

im pretty sure it's $19.80

Step-by-step explanation:

(44 x 55)/100 = $24.20

44 - 24.20 = $19.80

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2 years ago

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RoseWind [281]

The post card would be 6inches long

10-4=x
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