8th Grade Algebra: Answer Check
posted by Joy
Find the length of the 3rd side of each right triangle.
1. 8^2+15^2=c^2 Answer: c=17
2. 5^2+b^2=13^2 Answer: b=12
3. 9^2+13^2=c^2 Answer: c~15.81
Simplify. Assume that all variables are nonnegative.
{ this means square root
4. {12 Answer: 2{3
5. 2{75 Answer: 10{3
6. 3{72 Answer: 18{2
7. {200 Answer: 10{2
8. {3x^2 Answer: 3x
9. {3{18 Answer: 3{6
10. {5{10 Answer: 5{2
11. {15{6 Answer: 3{10
12. {3{27 Answer: 9
13. {18{14x Answer: 6{7x
14. {12{18 Answer: 6{6
15. {2/{5 Answer: {10/5
16. {75/{15 Answer: {5
17. 2/{2 Answer: {2
18. {9/{100 Answer: 3/10
19. {49/{100 Answer: 7/10
20. {27/{75 Answer 3/5
If I get any of these wrong, can someone please show me how to them correctly ?

Reiny
good job, I agree with all of them

DrBob222
1,2,3,4,5,6,7 are ok.
8. sqrt (3x^2) = x*sqrt(3) Check that.
9,10,11 ok.
12.
sqrt(3)*sqrt(27) = sqrt 3*sqrt(3*9)
9*sqrt(9) = 9*3= 27. Check that.
check 15. I think you just wrote it wrong. I get 1/5*sqrt(10). Check that.
The others look ok. 
DrBob222
I goofed on 12. It's ok.

Joy
Thank you both!

Reiny
I agree with DrBob
I should have checked them a bit less superficially.
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