10 POINTS!!!! i need help with my homework. i did the problems but i don't kknow if i did them right.?

Question

can you tell me which ones i did right and the ones i did wrong.

5. 2x + 8x = 10x
6. 17j + j =17j
7. 4ab + ab =4ab
8.2x² + 6x² =8x²
9.16m - 10m =6m
10.5t³ - 3t³ =2t³
11.15i² - 15i² =i²
12.3(5 + 2h) =30h
13.5(r + 2) + 7r =22r
14.a + b + a + c = aabc
15.6x + 7(y + x) = 30
16.3(r + 2x) - 3r = 12rs
17.10c + 5c + 6d + d = 21cd
18.(x + 5)y + 2y = 7xy
19.7rs + 2rs + 3rs =12rs
20.w + 14w – 6w = 20w
21.4.5v + 23v + v = 27v
22.3r² + 6r +2s² = ?
23.c² + 4d² + d² + 3d = ?
24. ⅓n + ²∕5n = ?
25. a + ⅓b + 4∕3b = ?
26. 35a +5n +2(n-1) =?

i'm in 8th grade doing 9th grade math and the teacher just introduced us to this so i don't really know what i'm doing.

Here are some more i tried to do. i had to use the distributive property to rewrite each expression.

1. 4(j + 4) = 4j+16
2. 5(n +2) = 5n + 10
3. (c + 9)3 = 3c+27
4. 2(w - 8) =2w+ -6
5 (s-7)7 =7s
6. -4(e + 6) =-4e +2
7.(b + 3)(-7) = -4+-7b
8. -8(v - 7) =-8 - -15
9.(2n+3)6 =12n + 18
10. 5(c+d) = 5c + 5d
11. -7(3x-1) = -21x - -8
12. (e-f)3 =3e-3f
13. 2(-3m+1) = -6m + 3
14. (2b-3)(-9) = 27 - -18b
15. -5(s + 7) = -5s+ -35
16. (t + 7)3 = 3 + 21
17. 6(-2v + 4) =-12 + 24
18.(m -n)(-3) = -3m- -3n

for the first section of my question i have to simplify each expression. so if i had something like 15 + 6h would it simplify to 21h.because i think it would.

Answer 1

I know, Its hard to do something you don't understand. I'm not really interested in your 10 points, just helping out:

6. 17j + j =18j
7. 4ab + ab =5ab
11. 15i² - 15i² =0
12.3(5 + 2h) =15 + 6h
13.5(r + 2) + 7r = 5r+10+7r = 12r + 10
14.a + b + a + c = 2a+b+c
15.6x + 7(y + x) = 6x+7y+7x = 13x+7y
16.3(r + 2x) - 3r = 3r+6x-3r = 6x
17.10c + 5c + 6d + d = 15c+7d
18.(x + 5)y + 2y = x+5y+2y = x+7y
20.w + 14w – 6w = 9w
21.4.5v + 23v + v = 28.5v
22.3r² + 6r +2s² = 5r² + 6r
23.c² + 4d² + d² + 3d = c² + 5d²+ 3d
24. ⅓n + ²∕5n = 11/15 n
25. a + ⅓b + 4∕3b = a + 5/3 b
26.35a +5n +2(n-1) = 35a + 5n + 2n - 2 = 35a + 7n - 2

Here’s the general sign rule for addition:
If you add +9 & -12, the answer wud be -3
If you add -9 & 12, the answer wud be 3
Because, the sign attached to the larger number always takes precedence .

The general rule for multiplication is:
+ multiplied by a + gives +
+ multiplied by a - gives -
- multiplied by a + gives -
- multiplied by a - gives +

4. 2(w - 8) =2w -16
5. (s-7)7 =7s - 49
6. -4(e + 6) =-4e - 24
7. (b + 3)(-7) = -7b - 21
8. -8(v - 7) = -8v + 56 (‘cuz - * - = +)
11. -7(3x-1) = -21x + 7
12. (e-f)3 =3e-3f
13. 2(-3m+1) = -6m + 2
14. (2b-3)(-9) = -18b + 27
15. -5(s + 7) = -5s -35
16. (t + 7)3 = 3t + 21
18. (m -n)(-3) = -3m- -3n

Answer 2

These r the right answers to the ones you got wrong
6.17j + j =18j
7.4ab +ab =5ab
8.2x^2 + 6x^2 = 8x^4
10.5t^3 - 3t^3 = 2t^6
11.15i^2 - 15i^2 = 0
12.3(5 + 2h) = 15 + 6h
13.5(r + 2) +7r = 12r +10
14.a + b + a + c = 2a + b + c
15.6x +7(y + x) = 13x + 7y
16.3(r + 2x) - 3r = 6x
17.10c + 5c + 6d +d = 15c + 7d
18.(x + 5)y + 2y = xy + 7y
20.w +14w - 6w = 9w
21.4.5v + 23v + v = 28.5v
22.3r^2 + 6r + 2s^2 = 9r^2 + 2s^2
23.c^2 + 4d^2 + d^2 + 3d = c^2 + 8d^6
24.?
25.?
26.35a + 5n +2(n-1) = 35a+7n-2

Answer 3

Okay I can help on 5 thru 21, but you have a problem on 22 thru 26 in that something about the instruction is missing... i.e., what action is wanted? Were there values given for the letters?

5 OK
6 X should be 18j
7 X should be 5ab
8 OK
9 OK
10. OK
11. X should be 0
12. X should be 15 + 6h
13. X should be 12R + 10
14. X should be 2a + b + c
15. X should be 13x + 7y
16. X should be 6x
17. X should be 15c + 7d
18. X should be xy + 7y
19. OK
20. X should be 9w
21. X should be 28.5v
22. thru 26 something missing here...no idea what is needed or wanted. Did they give you values for the letters. Did they say "factor or simplify these" ?

Have a good day

Answer 4

Listed below are those that i think you got wrong:
6. 17j+j = 18j
7. 4ab+ab = 5ab
11. 15i^2 - 15i^2 = 0
12. 3(5 + 2h) = 15 + 6h
13. 5(r+2) + 7r = 12r +10
14. a + b + a + c = 2a+b+c
15. 6x+ 7(y+x) = 13x + 7y
16. 3(r+2x) - 3r = 6x
17. 10c + 5c + 6d +d = 15c + 7d
18. xy + 5y + 2y = xy + 7y
20.w+14w-6w = 9w
21. 4.5v + 23v + v = 28.5v
22.stays as it is
23. c^2 + 4d^2 + d^2 + 3d = c^2 + 5d^2 + 3d
24. 1/3n + 2/5n = 11/15n
25. a + 5/3b
26. 35a + 7n - 2

Answer 5

5. correct
6. 18j
7. 5ab
8. correct
9. correct
10. correct
11. 0
12. 15 + 6h
13. 5r + 10 + 7r
= 12r + 10
14. 2a + b + c
15. 6x + 7y + 7x
= 13x + 7y
16. 3r + 6x - 3r
= 6x
17. 15c + 7d
18. xy + 5y + 2y
= xy + 7y
19. correct
20. 9w
21. 28.5v
22. 3r² + 6r +2s²
23. c² + 5d² + 3d
24. 5/15n + 6/15n
= 9/15n
= 3/5n
25. a + 5/3b
26. 35a + 5n + 2n - 2
= 35a + 7n - 2

The answers I typed with multiple lines just shows some of the steps to get to the answer, the final line is the answer. Hope this helps!

Answer 6

6. 18j
7. 5ab
11. 0
12. 15 + 6h
13. 10 + 12r
14. 2a + b + c
15. 13x + 7y
16. 3(r + 2x) - 3r =3r + 6x
17. 10c + 5c + 6d + d = 15c + 7d
18. (x + 5)y + 2y = xy + 7y
21. 4.5v + 23v + v = 28.5v
22. 3r² + 6r +2s² = 3r² + 6r +2s²
23. c² + 4d² + d² + 3d = c² + 5d² + 3d
24. ⅓n + ²∕5n = 11/5n
25. a + ⅓b + 4∕3b = a + 5/3b
26. 35a +5n +2(n-1) = 35a + 7n -2

Answer 7

Numbers 6, 7, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, and the ones you skipped are all wrong. Have you considered looking into free tutoring at your school?

Answer 8

6. should be 18j
7. should be 5ab
11. zero
12. 15 + 6h
13. 12r + 10
14. 2a +b+c

U don't understand algebra properly, different letters can't be added but 3j + j = 4j because 3j = 3 x j or j + j + j
Give a letter a value e.g j = 2 then work it out that way and when the answer is the same both sides of the = sign then u understand it. F.W.z
ps Good luck at skool

Answer 9

6. wrong, the answer is 18j
7. wrong, the answer is 5ab
11. wrong, the answer is 0
12. wrong, the answer is 15 + 6h
13. wrong, the answer is 12r + 10
14. wrong, the answer is 2a+b+c
15. wrong, the answer is 13x+7y
16. wrong, the answer is 2x
17. wrong, the answer is 15c + 7d
18. wrong, the answer is xy+7y
20. wrong, the answer is 9w
21. wrong, the answer is 28.5v
22.3r² + 6r +2s² = 3r² + 6r +2s²
23.c² + 4d² + d² + 3d = c² + 5d² + 3d
24. ⅓n + ²∕5n = 11/15n
25. a + ⅓b + 4∕3b = a+1 2/3
26. 35a +5n +2(n-1) =35a+7n -2

You can only combline LIKE terms.

Answer 10

5. CORRECT =)

6. INCORRECT =O
Explanation: j is another way to write 1j. 17j+1j=18j
Answer: 18j

7. INCORRECT =O
Explanation: ab another way to write 1ab. 4ab+1ab=5ab
Answer: 5ab

8. CORRECT =)

9. CORRECT =)

10. CORRECT =)

11. INCORRECT =O
Explanation: 15j-15j=0. Your answer was j, but j is the shortcut in math for writing 1j.
Answer: 0

12. INCORRECT =O
Explanation: In math, when something is inside parentheses and there is a number outside of it with no mathematical operation, the problem is telling you, "Distribute me!" Distributing is multiplying the number outside the parentheses by all the stuff in the parentheses. So let's distribute.
3(5+2h) = (multiply by 3!)5 - (multiply by 3!)2h = 15 - 6h
Answer: 15-6h

13. INCORRECT =O
Explanation: Distribute, as explained in #12.
5(r+2)+7r = r(multiply it by 5=5r) + 2(multiply by 5=10) + 7r = 5r+10+7r = 12r + 10

14. INCORRECT =O
Explanation: You wrote that a+a+b+c = aabc, but aabc is a shortcut in math or writing a*a*b*c, which you didn't mean. Let's simplify the equation: a+a is 2a (imagine "a" as a number, for example 4; 4+4=8, and 4*2 is 8 too, so a+a=2a) so simplified it is 2a+b+c
Answer: 2a+b+c

15. INCORRECT =O
Explatnation:6x+7(y+x) = Distributing (as explained in #12) results in 6x+7y+7x=13x+7y
Answer: 13x+7y

16. INCORRECT =O
Explanation:3(r+2x) - 3r = Distributing (as explained in #12) results in 3r+6x - 3r= 3r - 3r cancel each other out and result in zero, so you are left with 6x
Answer: 6x

17. INCORRECT =O
Explanation: Did you know that you can't add 10c and 6d together because they are not like terms; in other words, the letters are numbers but you don't know what number they are and adding two different letters is impossible? Add c with c and d with d. 10c+5c+6d+d= 15c+7d
Answer: 15c+7d

18. INCORRECT =O
Explanation: (x+5)y + 2y, distributed (as explained in #12) results in yx+5y+2y= 7y+yx
Answer: 7y+yx

19. GOOD JOB! CORRECT! =D

20. INCORRECT =O
Explanation: w is a shortcut in math for saying 1w. 1w+14w=15w, and 15w-6w=9w
Answer: 9w

21. INCORRECT =O
Explanation:4.5+23v is 27v, plus v (a shorcut for writing 1v) 28v
Answer: 28v

22. NOT ANSWERED =?)
Explanation: 3r(squared) plus 6r plus 2s(squared) is the problem literally. You cannot do anything to this problem because the r squared in 3r squared, r, and s in 2s are impossible to add. Remember to add the r squared with the r squared, the r's with the r's, and the s's with the s's.
Answer: 3r(squared) + 6r + 2s(squared), just as it is in the question

23. NOT ANSWERED =?)
Explanation: Add the d(squared) in the problem. 4d(squared) plus d(squared) is 5d(squared). You cannot simplify any further.
Answer: c(squared) + 5d(squared) +3d

24. NOT ANSWERED =?)
Explanation: Add the fractions. First you need to find a common denominator of the two denominators, 3 and 5, to add the fractions. The least common denominator is 15, in which both 3 and 5 multiplied equal. 1/3 with the common denominator 15 is 5/15, whilst 2/5 with the common denominator 15 is 6/15. Now add the fractions:5/15 + 6/15 = 13/15
Answer: 13/15

25. NOT ANSWERED =?)
Explanation: 1/3b + 4/3b = 5/3b. Now we left the a out. So the answer simplified is a+5/3b
26. Distribute (as explained in #12)!!!! In the parentheses portion, n(multiply it by its neighbor 2=2n) - 1(multiply by its neighbor=2) is 2n-2. Now we get the parentheses portion figured out; it is 2n-2. So the problem now is 35a+5n-2n-2. Add the n's with the n's. 5n-2n=3n. So the problem is now 35a+3n-2. You cannot simplify another farther because a's can ONLY be added with a's, n's can ONLY be added with n's, and regular number can ONLY be added with other regular numbers.
Answer: 35a + 3n -2


It's good to see that you try to fix up your mistakes. Keep up the good work!