8. 4j -2j -5k +3k (combine like terms)
2j -2k
B
9. -6m+4m +2n-3n
-2m-1n
D
10. ( 2x-1) + (3x-1) +(3x-1)
2x+3x+3x -1-1-1
8x-3
D
Answer:
n = 25/2
Step-by-step explanation:
First, you would want to subtract 7 from both sides of the equation. That would cancel the 7s out and 12-7 = 5. So now the equation looks like this: 2/5n = 5. Next, you would multiply both sides by 5/2, which is the reciprocal of 2/5. Now you have n= 5*(5/2). Lastly, you would just want to multiply 5*5 to get 25 and the 2 will just stay the same. So n = 25/2.
Answer:
- Length = 28 meters
- Width = 4 meters
Step-by-step explanation:
Assume the width of the rectangle is x. That means that the length of the rectangle is 7x which is 7 times as long as it is wide.
Perimeter of a rectangle:
= Length + length + Width + Width
Therefore:
7x + 7x + x + x = 64
16x = 64
x = 64/16
x = 4 meters
Length is 7 times as long:
= 4 * 7
= 28 meters
