Algebra

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Help!!

13. Use the Distributive Property to simplify 7(6x^2 + 5x + 4)

15. Evaluate 5w^2 if w = .5

19. Write a simplified expression to represent 5 times the sum of x and 3 increased by 10.
Is it 10+5(x+3) ?

Thanks
-MC

• Algebra -

Also,

15. Evaluate 5w^2 if w = .5

-MC

• Algebra -

13. 7(6x^2 + 5x + 4)
= 42x^2 + 35x + 28

Many mathematicians would consider
7(6x^2 + 5x + 4) to be more "simplified" than the expanded version.

15. 5(.5)^2 = 5(.25) = 1.25

19. yes

• Algebra -

I don't quite understand how you got that for #15..don't you have to take it to the second power?

And-- 7(6x^2 + 5x + 4) to be more "simplified" than the expanded version..what is this for?

Thanks
-MC

• Algebra -

I did.

5(.5)^2
= 5(.5)(.5)
= 5(.25)
= 1.25

For the other part, I simply commented that the original expression in factored form is considered to be more simplified than the expanded form. In other words, the question is poorly worded.
I should have simply said, "Expand"

• Algebra -