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# Am I correct?

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1.Which characteristic is correct for the function f(x)=−6x5+4x3 ?

---> odd

neither even nor odd

both even and odd

even

2.Solve the system of equations.

y=x−5

y=x^2−2x−9

(4, -1) or (-1, -6)

3. A used-car lot has 120 vehicles for sale. A sample of 15 of these vehicles finds that 6 of them have previously been in an accident.

What is the best estimate of the percent of the used-car lot's vehicles that have previously been in an accident?

48%

4.Two number cubes are rolled. Each number cube has sides numbered 1 through 6.

What is the probability that the outcome of the roll is an even sum or a sum that is a multiple of 3?

24/36=2/3

Jan 9, 2019
edited by awsometrunt14  Jan 9, 2019
edited by awsometrunt14  Jan 9, 2019
edited by awsometrunt14  Jan 9, 2019

#1
+111357
+2

1.

−6x^5+4x^3

Test for eveness.....replace x  with -x.....if we come back with what we started with....then even....so....

-6(-x)^5 + 4(-x)^3  =   6x^5 - 4x^3   not the same....so....not even

Test for oddness.....replace x with (-x)....if all the signs change, odd...

Note that this happened  in the first test.....so.....odd  !!!!!

2.  Correct   !!!!

3.     6 /15 =    2 / 5   =   40%

Jan 9, 2019
edited by CPhill  Jan 9, 2019
edited by CPhill  Jan 9, 2019
#2
+111357
+2

4.Two number cubes are rolled. Each number cube has sides numbered 1 through 6.

What is the probability that the outcome of the roll is an even sum or a sum that is a multiple of 3?

Outcomes        Frequency

2                         1

3                         2

4                         3

5                         4

6                         5

7                         6

8                         5

9                         4

10                        3

11                        2

12                        1

P ( even or multiple of 3)  = P(even) + P(multiple of 3) - P(even and multiple of 3)

= 18 / 36  + 12 /36  - 6 /36

24 /36

2 / 3   ⇒  CORRECT!!!

Jan 9, 2019