Asked by GummyBears
Please can someone help me.
1.Simplify x/7x+x^2
A.1/7+x;where x≠-7
B.1/7x;where x≠0
C.1/7+x;where x≠0,-7
D.1/7****
1.Simplify x/7x+x^2
A.1/7+x;where x≠-7
B.1/7x;where x≠0
C.1/7+x;where x≠0,-7
D.1/7****
Answers
Answered by
Reiny
the way you typed it:
x/7x+x^2
= (1/7)x^2 + x^2
= (8/7)x^2 -----> none of the choices
if you meant:
x/(7x)+x^2
= 1/7 + x^2 -----> none of the choices
If you meant:
x/(7x+x^2)
= x/(x(7+x))
= 1/(7+x) , x ≠ 0 -----> none of the choices
one of the choices could fit the last one, namely C, if you had included the brackets.
see how critical and essential those brackets are
x/7x+x^2
= (1/7)x^2 + x^2
= (8/7)x^2 -----> none of the choices
if you meant:
x/(7x)+x^2
= 1/7 + x^2 -----> none of the choices
If you meant:
x/(7x+x^2)
= x/(x(7+x))
= 1/(7+x) , x ≠ 0 -----> none of the choices
one of the choices could fit the last one, namely C, if you had included the brackets.
see how critical and essential those brackets are
Answered by
Reiny
looks like Steve gave you some important advice on this type of question yesterday.
http://www.jiskha.com/display.cgi?id=1462996317
You apparently chose to ignore his suggestion, and posted this question exactly the same way
http://www.jiskha.com/display.cgi?id=1462996317
You apparently chose to ignore his suggestion, and posted this question exactly the same way
Answered by
no body
Reiny your actually stupid
Answered by
no body
not smart
Answered by
Anonymous
1. (-8x^3+4x+1)÷(2x+1)
B. -4x^2+2x+1
2. The width, w, of a rectangular garden is x-2. The area of the garden is x^3-2x-4. What is an expression for the length of the garden?
D. x^2+2x+2
3. Christy drove 300 miles on her vacation. She drove an average of 1.25 times faster on the second 150 miles of her trip than she did on the first 150 miles of her trip. Which expression represented the time she spent driving? Let x= her speed on the first half of the trip.
D. 270/x
4. Simplify. x/7x+x^2
C. 1/7+x; where c=/= 0, -7
5. Simplify. 5x^3/7x^3+x^4
A. 5/7+x; where x=/= 0, -7
6. Simplify. x+5/x^2+6x+5
B. 1/x+1; where x=/= -1, -5
7. Simplify. x^2-3x-18/x+3
B. x-6; where x=/=-3
8. Simplify. 2/3a*2/a^2
C. 4/3a^2; where a =/= 0
9. Multiply. x+2/5x-15*(10x^2-25x-15)
D. (x+2)(2x+1)
10. Divide. (x^2-4/x-8)/x-2
D. x+2/x-8
11. Divide. (x^2+6x+9/x-1)/(x^2-9/x^2-2x+1)
A. (x+3)(x-1)/(x-3)
12. Divide. (24w^10+8w^12)÷(4w^4)
A. 6w^6+2w^8
13. Divide. (-6m^9-6m^8-16m^6)÷(2m^3)
C. -3m^6-3m^5-8m^3
14. Simplify into one fraction. -5x/x+3-7/x+3
A. -5x-7/ x+3
15. Simplify into one fraction. 4/x+3-2/x-5
A.2x-26/(x+3)(x-5)
16. Simplify into one fraction. 9/x-1+5/x+4
B. 14x+31/(x-1)(x+4)
17. Solve. 4/x+5/x=-3
C. x=-3
18. Solve. 1/3x9-2/x+3=2
B. x=-23/6
19. Solve. 8/x+15/x^2=-1
B. x=-5, -3
20. Bob and James are finishing the roof of a house. Working alone, Bob can shingle the roof in 10 hours. James can shingle the same roof in 16 hours. How long will it take them working together to shingle the roof? Round your answer to the nearest hundredth if necessary.
C. 6.15 hours
21. The time, t, required to drive a certain distance varies inversely with the speed, r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive the same distance at 85 miles per hour?
D. about 8.47 hours
22. Do the data in the table represent a direct variation or an inverse variation? Write an equation to model the data in the table. X=1, 3, 4, 7 ; Y=5, 15, 20, 35
C. direct variation y=5x
23. What are the excluded values of the function?
C. x=-16
B. -4x^2+2x+1
2. The width, w, of a rectangular garden is x-2. The area of the garden is x^3-2x-4. What is an expression for the length of the garden?
D. x^2+2x+2
3. Christy drove 300 miles on her vacation. She drove an average of 1.25 times faster on the second 150 miles of her trip than she did on the first 150 miles of her trip. Which expression represented the time she spent driving? Let x= her speed on the first half of the trip.
D. 270/x
4. Simplify. x/7x+x^2
C. 1/7+x; where c=/= 0, -7
5. Simplify. 5x^3/7x^3+x^4
A. 5/7+x; where x=/= 0, -7
6. Simplify. x+5/x^2+6x+5
B. 1/x+1; where x=/= -1, -5
7. Simplify. x^2-3x-18/x+3
B. x-6; where x=/=-3
8. Simplify. 2/3a*2/a^2
C. 4/3a^2; where a =/= 0
9. Multiply. x+2/5x-15*(10x^2-25x-15)
D. (x+2)(2x+1)
10. Divide. (x^2-4/x-8)/x-2
D. x+2/x-8
11. Divide. (x^2+6x+9/x-1)/(x^2-9/x^2-2x+1)
A. (x+3)(x-1)/(x-3)
12. Divide. (24w^10+8w^12)÷(4w^4)
A. 6w^6+2w^8
13. Divide. (-6m^9-6m^8-16m^6)÷(2m^3)
C. -3m^6-3m^5-8m^3
14. Simplify into one fraction. -5x/x+3-7/x+3
A. -5x-7/ x+3
15. Simplify into one fraction. 4/x+3-2/x-5
A.2x-26/(x+3)(x-5)
16. Simplify into one fraction. 9/x-1+5/x+4
B. 14x+31/(x-1)(x+4)
17. Solve. 4/x+5/x=-3
C. x=-3
18. Solve. 1/3x9-2/x+3=2
B. x=-23/6
19. Solve. 8/x+15/x^2=-1
B. x=-5, -3
20. Bob and James are finishing the roof of a house. Working alone, Bob can shingle the roof in 10 hours. James can shingle the same roof in 16 hours. How long will it take them working together to shingle the roof? Round your answer to the nearest hundredth if necessary.
C. 6.15 hours
21. The time, t, required to drive a certain distance varies inversely with the speed, r. If it takes 12 hours to drive the distance at 60 miles per hour, how long will it take to drive the same distance at 85 miles per hour?
D. about 8.47 hours
22. Do the data in the table represent a direct variation or an inverse variation? Write an equation to model the data in the table. X=1, 3, 4, 7 ; Y=5, 15, 20, 35
C. direct variation y=5x
23. What are the excluded values of the function?
C. x=-16
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