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.

()1. how do you find range? 2.the following set of data is to be organized into a histogram. if there are to be five intervals on the graph, what should the length of each interval be? 30, 34, 23, 21, 27, 25, 29, 29, 25, 23, 32, 31

Dean and karlene get paid to write songs. dean is paid a one-time fee of $20 plus $80 per day. karlene is paid a one-time fee of $25 plus $100 per day. write an expression to represent how much a producer will pay to hire both to work the same number of days on a song.

Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 25002500 grams and a standard deviation of 800800 grams while babies born after a gestation period of 40 weeks have a mean weight of 27002700 grams and a standard deviation of 385385 grams. if a 3232-week gestation period baby weighs 21252125 grams and a 4040-week gestation period baby weighs 23252325 grams, find the corresponding z-scores. which baby weighs lessless relative to the gestation period?