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3 years ago

What is the value of the expression x + (–y) when x = –2.3 and y = –5.9?

Mathematics

2 answers:

Natasha2012 [34]3 years ago

6 0

X+(-y)
x=-2,3
y=-5,9
-2,3-(-5,9)=-2,3+5,9=3,6
the value of the expresion x+(-y) is 3,6

kramer3 years ago

5 0

X + (-y) = -2.3 + ( - (-5.9) ) = -2.3 + 5.9 = 3.6

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3 years ago

PLEASE HELP/ANSWER! From 1980 to 1990, Lior’s weight increased by 25%. If his weight was k kilograms in 1990, what was it in 198

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The weight in 1980 is $\frac{4k}{5}$ kilograms

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From 1980 to 1990, Lior’s weight increased by 25%

His weight is "k" kilograms in 1990

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This is a percentage increase problem

Let "x" be the weight in kilograms in 1980

The percentage increase is given by formula:

$\text{Percentage increase } = \frac{\text{Final value - initial value}}{\text{initial value}} \times 100$

Here,

Initial value in 1980 = x

Final value in 1990 = k

Percentage increase = 25 %

Substituting the values in formula,

$25 = \frac{k-x}{x} \times 100\\\\25x = 100(k-x)\\\\x = 4(k-x)\\\\x = 4k - 4x\\\\5x = 4k\\\\x = \frac{4k}{5}$

Thus the weight in kilograms in 1980 is $\frac{4k}{5}$

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3 years ago

Find the sum.

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You are gonna use the distributive property.

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So you are going to multiply 4 with everything inside the first set of parenthesis and your gonna multiply 3 with everything insides the second set of parenthesis.

4 x 2.5g - 4 x 4 + 3 x 1.2g - 3 x 2

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You wanna combine like terms:

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You answer is 6.4g + 10.

Hope this Helps!!

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3 years ago