Mistake in Line 2 : Was in the determining the values for a ,b,c
Mistake in Line 4 : Not taking the square roots of both sides.
Step-by-step explanation:

First Mistake : Line 2

Second Mistake : Line 4

Correct Solution :


Number 5 would be D i think
K=9.7-5.41
K=4.29
The value of k is 4.29. Hope this help
It is a tricky question .Only hard part is understanding the word problem and then converting it into numbers. Let us concentrate on the problem now.
Let us assume the unknown number = x
The coming to the equation part, we get
6(2 - x) = 10
12 - 6x = 10
-6x = 10 - 12
-6x = -2
x = 2/6
= 1/3
So the unknown number is 1/3. I hope i have solved the question to your satisfaction and in future you can do this type of problems by yourself.
V = 20 cm ^3
multiply 6 cm by 5 cm by 2/3 cm and your answer is 20cm^3