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3 years ago

Which equations are true?

Mathematics

2 answers:

Nutka1998 [239]3 years ago

6 0

B, the rest are wrong

aleksklad [387]3 years ago

4 0

Answer:

<h2>C : None of the above</h2>

Step-by-step explanation:

A : -2+(-2) = 0 False

-2+(-2) = -4

A negative plus a negative is actually a negative. When adding signed numbers, it is useful to think of positive numbers as gains and negative numbers as losses.

B : 2-(-2) = 0 False

2-(-2) = 4

Because there is subtraction sign so if subtraction sign added to negative sign it makes positive from 2-(-2) it will be 2+2

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A lamp sold for $17.60, which represented a 12% discount. What was the original price of the lamp

guajiro [1.7K]

1) Find the percentage difference between 12% and 100%.

100-12= 88%

1a) Put the percentage in its decimal form.

88%/100= 0.88

2) Divide 17.60 by 0.88

17.60/0.88= 20

Therefore, the original price of the lamp is $20.

Hope this helps!

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3 years ago

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Which equation results from adding the equations in this system? x + 6 y = 9. Negative x + 2 y = negative 15. 8 y = negative 6 8

nignag [31]

Answer:

8y = - 6

Step-by-step explanation:

Given the 2 equations

x + 6y = 9 → (1)

- x + 2y = - 15 → (2)

Adding the 2 equations term by term gives

(x - x) + (6y + 2y) = (9 - 15), that is

8y = - 6

8 0

4 years ago

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A cube has a volume of 27 squared feet. What is the length of each side?

Step2247 [10]

Hello!

The formula for volume of a cube is $V= a^{3}$ ; you are given the volume, so plug it into the formula for $V$ .

$V= a^{3}$
$27= a^{3}$

Take the cube root of each side:

$27= a^{3}$
$\sqrt[3]{27} = a^{3}$
$3=a$

Answer:
The length of each side is 3 cubic feet.

7 0

4 years ago

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The domain of u(x) is the set of all real values except 0 and the domain of v(x) is the set of all real values except 2. What ar

muminat

Answer:

Third option

x ≠2 and x cannot be any value for which v(x) = 0

Step-by-step explanation:

In this problem we are asked to find the domain of the function

$(UoV)(x)$

We know that $(UoV)(x) = U(V(x))$ .

We know that:

Domain of U(x) is all real numbers except x = 0

Domain of V(x) is all real numbers except x = 2.

Then the domain of the composite function U(V (x)) is:

all real numbers except x = 2. (since x = 2 does not belong to the domain of V(x) and all values of x for which V(x) = 0 (since x = 0 does not belong to the domain of U(x))

Finally the domain of $(UoV)(x)$ ) is:

$x \neq 2$ and $V(x) \neq 0$

4 0

4 years ago

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write an equation with the solution x=20. The equation should have the variable on both sides, a fractional coefficient on the l

Viefleur [7K]

1/2x+9=2x/2-1. I hope this meets ur criteria. It works and equals 20.

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3 years ago

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