Answer:
Equations
Step-by-step explanation:
16:
7 · (-3) = -21
-3 · 7 = -21
-21 ÷ 7 = -3
-21 ÷ (-3) = 7
17:
-4 · (-5) = 20
-5 · (-4) = 20
20 ÷ (-4) = -5
20 ÷ (-5) = -4
18:
1.5 · (-3) = -4.5
-3 · 1.5 = -4.5
-4.5 ÷ 1.5 = -3
-4.5 ÷ (-3) = 1.5
This is 7th grade?
Hope I helped :)
<h3><u>Solution:- </u></h3>
Let the number to be added be A
Now,
![\begin{gathered}\implies\quad \sf −5x^3 + 4x − 3 + A = x^2 − x − 1 \\\end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%5Cimplies%5Cquad%20%5Csf%20%E2%88%925x%5E3%20%2B%204x%20%E2%88%92%203%20%20%2B%20A%20%3D%20x%5E2%20%E2%88%92%20x%20%E2%88%92%201%20%5C%5C%5Cend%7Bgathered%7D%20)
Transposing (−5x³+ 4x − 3 ) to other side-
![\begin{gathered}\\\implies\quad \sf A = x^2 − x − 1 -( −5x^3 + 4x − 3) \\\end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%5C%5C%5Cimplies%5Cquad%20%5Csf%20%20%20A%20%3D%20x%5E2%20%E2%88%92%20x%20%E2%88%92%201%20-%28%20%E2%88%925x%5E3%20%2B%204x%20%E2%88%92%203%29%20%5C%5C%5Cend%7Bgathered%7D%20)
Remember if there is a -ve sign before a bracket the signs of whole of the terms changes on opening bracket
![\begin{gathered}\\\implies\quad \sf A = x^2 − x − 1 + 5x^3 - 4x + 3\\\end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%5C%5C%5Cimplies%5Cquad%20%5Csf%20%20%20A%20%3D%20x%5E2%20%E2%88%92%20x%20%E2%88%92%201%20%2B%205x%5E3%20-%204x%20%2B%203%5C%5C%5Cend%7Bgathered%7D%20)
Putting like terms together -
![\begin{gathered}\\\implies\quad \sf A = 5x^3 +x^2 - x -4x +3 -1 \\\end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%5C%5C%5Cimplies%5Cquad%20%5Csf%20%20%20A%20%3D%205x%5E3%20%2Bx%5E2%20-%20x%20-4x%20%2B3%20-1%20%20%5C%5C%5Cend%7Bgathered%7D%20)
![\begin{gathered}\\\implies\quad \sf A = 5x^3 +x^2 -5x +2 \\\end{gathered}](https://tex.z-dn.net/?f=%5Cbegin%7Bgathered%7D%5C%5C%5Cimplies%5Cquad%20%5Csf%20%20%20A%20%3D%205x%5E3%20%2Bx%5E2%20-5x%20%2B2%20%5C%5C%5Cend%7Bgathered%7D%20)
Therefore, 5x³+x²-5x +2 should be added to −5x³+ 4x − 3 to get x²− x − 1
It would jebdocoovigibibi
Answer: 62 words per minute.
Step-by-step explanation: 496/8=62.