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LekaFEV [45]
3 years ago
9

Find f(-2) for the function f(x)=3x^2-2x+7

Mathematics
1 answer:
Yuliya22 [10]3 years ago
5 0

Answer:

23

Step-by-step explanation:

plug -2 in for x then solve

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A CD usually sells for $14.00. If the CD is 20% off, and sales tax is 7%, what is the total price of the CD, including tax?
tankabanditka [31]

Answer:

the total price of the CD including tax is $11.984

Step-by-step explanation:

The computation of the total price of the CD including tax is shown below:

The Selling price of the CD is $14

CD is 20% off

And, the sales tax rate is 7%

So, the total price of the CD is

= ($14 - $14 × 20%) × (1.07)

= $11.2 × 1.07

= $11.984

Hence, the total price of the CD including tax is $11.984

8 0
3 years ago
A line passes through the points (5, –7.5) and has a y-intercept of 10.
brilliants [131]

Answer:y=0.5x+10

Step-by-step explanation:

need help with explanation?

4 0
3 years ago
Plz prove this for me.....
s344n2d4d5 [400]

I've answered your other question as well.

Step-by-step explanation:

Since the identity is true whether the angle x is measured in degrees, radians, gradians (indeed, anything else you care to concoct), I’ll omit the ‘degrees’ sign.

Using the binomial theorem, (a+b)3=a3+3a2b+3ab2+b3

⇒a3+b3=(a+b)3−3a2b−3ab2=(a+b)3−3(a+b)ab

Substituting a=sin2(x) and b=cos2(x), we have:

sin6(x)+cos6(x)=(sin2(x)+cos2(x))3−3(sin2(x)+cos2(x))sin2(x)cos2(x)

Using the trigonometric identity cos2(x)+sin2(x)=1, your expression simplifies to:

sin6(x)+cos6(x)=1−3sin2(x)cos2(x)

From the double angle formula for the sine function, sin(2x)=2sin(x)cos(x)⇒sin(x)cos(x)=0.5sin(2x)

Meaning the expression can be rewritten as:

sin6(x)+cos6(x)=1−0.75sin2(2x)=1−34sin2(2x)

3 0
3 years ago
The diagram shows the sports played by 80
-BARSIC- [3]

Answer:

wheres the diagram

Step-by-step explanation:

3 0
4 years ago
What is 26,576.96 rounded to the nearest hundredth?
Alex Ar [27]

Answer:

26,577

Step-by-step explanation:

4 0
3 years ago
Read 2 more answers
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