Answer:
n=3
Step-by-step explanation:
Simplifying
8n + 12 + -5n = 21
Reorder the terms:
12 + 8n + -5n = 21
Combine like terms: 8n + -5n = 3n
12 + 3n = 21
Solving
Solving for variable 'n'.
Move all terms containing n to the left, all other terms to the right.
Add '-12' to each side of the equation.
12 + -12 + 3n = 21 + -12
Combine like terms: 12 + -12 = 0
0 + 3n = 21 + -12
3n = 21 + -12
Combine like terms: 21 + -12 = 9
3n = 9
Divide each side by '3'.
n = 3
hello :
8n + 12 - 5n = 21
8n + 12 - 5n-12 = 21 -12
3n =9
n = 9/3 = 3
4×2÷8
so 8+7=15
=7x=15
so,x=15/7
The answer is 144°
180 - 36 = 144
Marie will NOT complete the chapter in time
If Marie writes at a constant speed of 4 pages per hour, to write a 45-page chapter she will take;
45/4 = 11.25
= 11 ¼ hours
11 ¼ hours > 8 hours
Therefore Marie will NOT complete the chapter in time
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