Posted by **Joy** on Tuesday, January 13, 2009 at 11:23pm.

4. 311 + 411 Answer: 811

7. 72 - 28 Answer: 12 ??

8. 48 + 75 Answer: 93

9.(310) Answer: 19 + 610

10. 27/64 (Fractions) Answer 33/8 ??

11. 1020 - 380 Answer: 105

12. 6/49 Fractions) Answer: 6/7 ??

13. 32 * 14 Answer:stays the same ??

14. 6/50 Answer: 103

15. 30 * 212 Answer: 30 * 43

If I got any of these wrong, can someone please tell me how to do them correctly?

- 8th Grade Algebra-Radicals:Answer Check -
**Reiny**, Wednesday, January 14, 2009 at 9:04am
I will assume your means 'square root'

4. 311 + 411 Answer: 811 --- I recall 3+4 used to be 7, not 8

7. 72 - 28 Answer: 12 ??

---- 7√2 - 2(2√2) = 3√2

9.(310) Answer: 19 + 610 --- how did you get that ????

---- 3√10 stays that way

11. 1020 - 380 Answer: 105 --- NO

10(√4)(√5) - 3(√16)(√5) = 20√5 - 12√5 = 8√5

13. 32 * 14 Answer:stays the same ?? --- no

----- 3√2 * √14 = 3√28 = 3(√4)(√7) = 6√7

14. 6/50 Answer: 103 --- not clear, is the 50 part of the square root ?

If so, then √(6/50) = √(3/25) = (√3)/5

If it is (√6)/50 then it stays that way

15. 30 * 212 Answer: 30 * 43 -- don't understand what you did

√30 * 2√12 = 2√360 = 2(√9)(√4)(√10) = 24√10

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