Answer with explanation:
The given statement is which we have to prove by the principal of Mathematical Induction

1.→For, n=1
L H S =2
R H S=1
2>1
L H S> R H S
So,the Statement is true for , n=1.
2.⇒Let the statement is true for, n=k.

---------------------------------------(1)
3⇒Now, we will prove that the mathematical statement is true for, n=k+1.

Hence it is true for, n=k+1.
So,we have proved the statement with the help of mathematical Induction, which is

Answer:
0.9 dm³
Step-by-step explanation:
1 dm = 10cm
1 dm³ = 10cm×10cm×10cm = 1000 cm³
1000 cm³ .............. 1 dm³
900 cm³ ................x dm³
x = 900×1/1000 = 0.9 dm³
1. substitute:
4+(7-5)
2. simplify:
4+2
3. evaluate:
6
the answer is 6.