Apply the properties of exponents to verify that each statement is an identity
.(3^n+1) − 3^n =( 2 ∙ 3^n) for integer values of n

Answer and explanation :

We have given expression for integer value of n

We have to prove L.H.S = R.H.S

Lets take L.H.S

can be written as

So

Now take as common

= R.H.S

Hence proved

1)is not similar since corresponding sides are not in the same ratio

2)are similar since corresponding sides are in the same ratio and corresponding angles are equal

hope it will

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the answer is 31.27mph