Answer:
the first one should be -548
Step-by-step explanation:
plug in the values and you should get -30+7(-72-2).
-6(1+7x)+7(1+6x)=-2
This is False.
Use distributive property:
-6 -42x + 7 +42x = -2
Combine like terms to get:
1 = -2
Since 1 is not -2, it is false.
Answer:

Step-by-step explanation:

Answer:
1200
Step-by-step explanation:500-200=300
1250-500=750
750-300=450
750+450=1200
Answer:
only (2) and (4) are polynomial out of given options.
Step-by-step explanation:
Polynomial is an expression having variables having positive integer exponents with real constant coefficients. example 
We are given some polynomials and we have to choose whether are polynomial or not.
Consider ,
1) 
Since, Polynomial does not have a fractional exponent.
So, 1) Not a polynomial.
2) 
Since all of the variables have integer exponents that are positive this is a polynomial.
3) 
Not a polynomial because a term has a negative exponent
.
4) 
Since all of the variables have integer exponents that are positive this is a polynomial.
Thus, only (2) and (4) are polynomial out of given options.