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3 years ago

Can someone explain this to me ?

Mathematics

1 answer:

Alex Ar [27]3 years ago

8 0

Suppose you had f=6, g=2, h=3 and you were asked to find

f - g - h

You would do it by substituting the given values for the letters to get

6 - 2 - 3

And this can be simplified to

_____

The question at hand is basically the same. You are given values of f(x), g(x), h(x) and asked to find their signed sum.

f(x) - g(x) - h(x)

= (3x+5) - (4x²-2) - (x²-3x+1) . . . . substitute the given values

= 3x + 5 - 4x² + 2 - x² + 3x - 1 . . . use the distributive property to eliminate parentheses. A minus sign in front changes the sign of every term inside parentheses.

= x²(-4-1) +x(3+3) +(5+2-1)

= -5x² + 6x + 6 . . . . . . collect terms . . . . matches the first choice

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Scrat [10]

Percentage by which the average value of mid sized car decreases each year = 8%
Retail value of a car today = v dollars
Amount of decrease in the value of the car after 1 year = (8/100) * v
   = 2v/25 dollars
Then
The equation that represents the value of the car after 1 year = v - (2v/25) dollars
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So following this expression the value of the mid sized car can be easily determined after 1 year. I hope this is the answer you were looking for and the procedure is also clear to you.

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3 years ago

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Can someone please help me!

kirill115 [55]

I will give u the steps
add up all of the values
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3 years ago

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Please help!!

sveta [45]

For this case we have the following equation:
$d = \sqrt{\frac{3h}{2}}$
Where,
d: the distance they can see in thousands
h: their eye-level height in feet
For Kaylib:
$d = \sqrt{\frac{3(48)}{2}}$
$d=\sqrt{3(24)}$
$d=\sqrt{72}$
$d=6\sqrt{2}$
For Addison:
$d = \sqrt{\frac{3(85\frac{1}{3})}{2}}$
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$d=\sqrt{128}$
$d=8\sqrt{2}$
Subtracting both distances we have:
$8\sqrt{2} - 6\sqrt{2} = 2\sqrt{2}$
Answer:
$2\sqrt{2}$
B. 2√2 mi

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