1 + .3 +.07+.005 x 10 - 6
No, it is not a valid inference because her classmates do not make up a random sample of the students in the school.
Answer:

Step-by-step explanation:
Ok first multiply the first two monomials:

Then multiply THAT with the OTHER monomial:

This should be the answer. Let me know if it's wrong.
Answer:
arithmetic
Step-by-step explanation:
hope it helped