Answer:
1/0.4=10/4=5/2...............
Answer:
Not sure if this is an help anymore but the first one is (2,-1)
The last one is correct.
Answer:
Step-by-step explanation:
5/6 + (-1/2) =
5/6 - 1/2 =
5/6 - 3/6 =
2/6 which reduces to 1/3 <====
Answer:
- <em>The studend first made an error in the </em><u><em>second setp</em></u><em>, </em>since he/she did not apply the distributive property correctly.
Explanation:
Here, I copy each step given and review them algebraically, until finding the first error made by the student.
0) <u>Start: System of equations:</u>
1) <u>Step 1:</u>
−2(y) = −2(15 − 2z) [Equation A is multiplied by −2.]
2y = 3 − 4z [Equation B]
This procedure is algebraically correct, since the student used correctly the multiplicative property of equalities: both sides of the equation A are multiplied by the same number, 2.
Whereas, the equation B is not algebraically manipulated.
2) <u>Step 2: </u>
- −2y = 15 − 2z [Equation A in Step 1 is simplified.]
This procedure is algebraically wrong, since the student applied wrongly the distributive property of multiplication to simplify the equation A:
- The error is that the student did not multiply - 2 times 15 and -2 times - 2z
- The correct procedure had been:
-2y = -2(15) - 2( - 2z)
-2y = - 30 + 4z
<u>Conclusion:</u> The studend made an error in the second setp, since he/she did not apply the distributive property correctly.
Good afternoon.
120square --- 34h
x square --- 1h
34x = 120
x = 120/34
x = 3,5 square