Add 3x4 - 7x3 + 12x - 9 GUEST, GUEST
to
The sum is closed because
Roxanne wants to test the idea
that polynomials are closed
under addition. Her work and
explanation are shown.
are
and by definition
the sum is a polynomial.
Drag an expression and phrases
to the boxes to complete the
statement.
5x2 - (2x)3 + (4x)-1
(2x)3 + 2.1x2 - 11
-8x-2 f(3x)3 - 12x6 + 7
the exponents
the variables
the coefficients
integers
whole numbers
real numbers

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.  

therefore, the correct answer is d.  

step-by-step explanation: so we look at the formula un = a + (n-1)d

un is the amount of seats

n is the nth term aka row number

a is the original sequence/row number

d is the difference between each term

so in this a=22 d=6 and n can remain as n because we are simply formjng a rule

lets put these in the equation

un=22+(n-1)(6)

this is your answer to part a

however

lets double check that this is correct, we'll try putting it into the second term

un=a+(n-1)d

u2=22+(2-1)(6)

u2=22+6

u2=28

as the question said the second row has 28 seats so now we know the formula we made is correct.

as for part b

un=a+(n-1)

its asking us to find a row with 100 seats.

remember un was the amount of seata so all we do is substitute this in.

un=100 a=22 d=6

un=a+(n-1)d

100=22+(n-1)(6)

so now we simplify to find n which is the row number.

100-22=22+(n-1)(6)-22

78=(n-1)(6)

78/6=(n-1)(6)/6

13=n-1

13+1=n-1+1

14=n

so now we know that in the 14th row there is 100 seats.

hope this and that you understood! its my first time using the app or anyone out on here : p its also me to revise so a bunch! ask more questions if you dont understand ☺

b. 2 and 4

step-by-step explanation:

fd

step-by-step explanation: