math 8th grade

posted by .

I need to combine like terms. Here are a few questions that I am having trouble with.

-r - 10r

n-4-9

-4+7(1-3m)

Please help ! thank you.

  • math 8th grade -

    -r - 10r = -11r

    n-4-9 = n - 13

    -4+7(1-3m) = -4 + 7 - 21m = 3 - 21m

  • math 8th grade -

    -r-10r=-11r (because -1-10=-11)
    n-4-9=n-13 (-4-9=-13)
    -4+7(1-3m)=-4+7-21m=3-21m

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. are these correct

    Here is the questions it says to simplify: xyy^2 x^3 and here is the answer x^4 y^3 ---------------------------- here is another one m^3 pmxm^2 x^3 p^5 and here is the answer m^6 p^6 x^4 ---------------------------- and here is another …
  2. 8th Grade Algebra

    Write the length of the line below as a sum. Then combine like terms. ]-----------[-------[ 3/4x 2/3x I don't get what they mean by length as a term.
  3. Algebra

    Equation: 2x/5-x/3=5 (2x/5 and x/3 is a fraction) I know that you are suppose to combine like terms, like x, but don't know what I need to do, since they are fractions. Help please.
  4. 8th grade math

    collect like terms 3a+2a^2+a-a^2
  5. 8th Grade

    Me and my friend are making our own 8th grade binder, you know like writing down planns for our 8th grade year. Here are the sections: - To-Do-List - Doodles (if you are bored) - Projects that are do (school plans) - Graduation Plans …
  6. Algebra

    please help me solve my homework with all the work involved. i have trouble paying attention in class so it's hard for me to do my homework. here are a few of the questions. I need to find out what the letters equal. 1.) 10(-4+y)=2y …
  7. Math ( Percents as Ratios)

    Sue receives a test score of 75% on a test with 20 questions. How many did she get correct?
  8. math

    could someone check my work please? I have to solve for 'x' Questions ~ 1. 3x – 19 = -2 Add ‘19’ to each side of the equation ~ -19+19+3x= -2+19 Combine like terms~ -19+19=0 0+3x= -2+19 3x= -2+19 Combine like terms~ -2+19=17
  9. math

    could someone check my work please? I have to solve for 'x' Questions ~ 1. 3x – 19 = -2 Add ‘19’ to each side of the equation ~ -19+19+3x= -2+19 Combine like terms~ -19+19=0 0+3x= -2+19 3x= -2+19 Combine like terms~ -2+19=17
  10. Help ASAP

    I'm having trouble with the surface area of the sphere. Like, here's a question I'm having trouble solving: What is the approximate surface area of the sphere if it is 7 centimeters?

More Similar Questions