Answer:
b. -75x+57=-75x+57
Step-by-step explanation:
If an equation after solving does not give the solution but give a true statement then the equation has infinitely many solution,
In option a.
57x+57=-75x-75
57x + 75x = -75 - 57
132x = -132
⇒ x = -1
i.e. it has only one solution,
In option b.
-75x+57=-75x+57
-75x + 75x = 57 - 57
0 = 0 ( True )
i.e. it has infinitely many solution.
In option c.
75x+57=-75x+57
75x + 75x = 57 - 57
150x = 0
⇒ x = 0
In option d.
-57x+57=-75x+75
-57x + 75x = 75 - 57
18x = 18
⇒ x = 1
i.e. it has only one solution.
(x-11)(7x-2)=0
x=11 <u>or</u> x=2/7
Answer: 3x+4-5x
3x+4=5x
3x+4-5x=0
Answer: 26.8%
Average = 0.268/1 = 0.268
To convert to %, multiply by 100, therefore, 0.268 × 100= 26.8%
hope you understand......