grade 5 maths lessons

grade 5 maths lessons
Math quiz tomorrow. HELP. ?

I covered basically the whole chapter except the last 2 lessons, which are really confusing to me.

They are all dealing with expressions, this is 8th grade math.
If anyone could please solve some of the problems I list and explain to me how it’s done, that would be great. [:

So here's some random problems that I'm having trouble with...

9m - 5m + 3

-5(w - 4)

-(3 - 10y)

(7b + 1)(5)

I get so confused with these.
They should be easy, but I'm not fully clicking. If I could understand how a few of them are done, then I think I'd understand. Thanks. I have a math quiz on the chapter tomorrow, so, yeah. [:
Shay, you didn't even explain how you got the answers.
Oh, nevermind haha.
Sorry.

9m - 5m + 3 = 4m + 3 just minus the m's from eachother

-5(w - 4) = -5w + 20 multiply out the brackets by multiplying -5 by w and -5 by -4

-(3 - 10y) = 10y - 3 just change these by making them negative but the minus ten y becomes positive because of the two negatives make a positive in multiplying

(7b + 1)(5) = 35b + 5 again multiply out the brackets 7b multipled by 5 and 1 mulitplyed by 5

good luck in the test

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