Which statements are true? 1. 20 is the greatest common factor of 40 and 80.

2. 64 is a perfect square.

3. x(x^2+1)=x^3+x

4. x^2-81 cannot be factored

5. 3x^3 is the GCF of 15x^4+9x^2+3

6. (x+5) is a factor of x^2-2x+15

7. (4x^2+2)(x^2-2)=4x^4-6x^2-4

8. x+3 is a factor of x^2+9

9. The product of two binomials is always a trinomial.

10. 57 is a prime number.

Average acceleration: i have no idea how to do this.

Which equation shows the variable terms isolated on one side and the constant terms isolated on the other side for the equation -1/2x+3=4-1/4x? a. -1/4x=1 b. -3/4x=1 c. 7=1/4x d. 7=3/4x

Use the given degree of confidence and sample data to construct a confidence interval for the population mean mu . assume that the population has a normal distribution. a laboratory tested twelve chicken eggs and found that the mean amount of cholesterol was 185 milligrams with sequals 17.6 milligrams. a confidence interval of 173.8 mgless than muless than 196.2 mg is constructed for the true mean cholesterol content of all such eggs. it was assumed that the population has a normal distribution. what confidence level does this interval represent?