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Kipish [7]
2 years ago
7

Ms. Shafner would like to tip her hairdresser 20%. If her haircut cost $38.00, how much should she give her as a tip? *

Mathematics
1 answer:
olganol [36]2 years ago
3 0

Answer:

7.6

Step-by-step explanation:

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How do I use the Descartes Rule of Signs to determine all possible number of positive and negative zeros?
larisa [96]

Answer:

We conclude that:

  • 2  or 0 positive real roots
  • 2  or 0 negative real roots

Step-by-step explanation:

Descartes Rule states that if the terms of a single-variable polynomial with real coefficients are ordered by descending variable exponent, then the number of positive roots of the polynomial is:

  • Either equal to the number of sign differences between consecutive nonzero coefficients,
  • Or is less than it by an even number.

Given the function

f\left(x\right)=x^4-2x^3-4x^2+2x+3

So, the coefficients are 1, −2, −4, 2, 3

As can be seen, there are 2 changes.

This means that there are 2 or 0 positive real roots.

To find the number of negative real roots, substitute x with -x in the given polynomial:

x^4-2x^3-4x^2+2x+3  becomes x^4+2x^3-4x^2-2x+3

The coefficients are 1, 2, −4, −2, 3

As can be seen, there are 2 changes.

This means that there are 2 or 0 negative real roots.

Therefore, we conclude that:

  • 2  or 0 positive real roots
  • 2  or 0 negative real roots

8 0
2 years ago
-X/3=9 linear equations
Pepsi [2]

Answer:

x = -27

Step-by-step explanation:

-x/3 = 9

Multiply each side by -3

x/-3 * -3 = 9*-3

x = -27

3 0
3 years ago
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Need help please answer
Troyanec [42]
See the attached picture:

3 0
3 years ago
Please help asap! ty!! giving double points if you answer all questions!! tysmmm
vlabodo [156]

Answer:

1 A is correct, 2 D is correct, 3 D is correct, 4 B is correct

Step-by-step explanation:

5 0
3 years ago
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HELP PLEaseeeeeeeeeeeee thank youi
avanturin [10]

Answer:

d=4.5t

Step-by-step explanation:

in two hours, Francine went 9 miles

9/2=4.5

the distance equals 4.5 times each cycling time.

d=4.5t

7 0
2 years ago
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