CPhill

3x  + 4y    = 72

To find the  y intercept, let  x  = 0  and we have

3(0)  + 4y  = 72

4y  = 72    divide by 4

y   =   18

To find the  x  intercept, let  y  =0  and we have

3x  + 4(0)   = 72

3x  = 72  divide by 3

x  = 24

Here's a possibility  :

l  h - 12.5  l  =  2.5

Note

l 15  - 12.5  l  = l 2.5   l  = 2.5       and   l 10  - 12.5   l  =    l -2.5 l  =  2.5

HAHAHA!!!....no need to doubt yourself, RP...you are completely  CORRECT  !!!!

The degree is found by adding the exponents of each term  and selecting the greatest sum

Note that we  could write this as :

5a^6b^1c^2d^0e^0f^0g^0h^0  + 8a^0b^0c^0d^5e^0f^0g^0h^0   + 7a^0b^0c^0d^0e^6f^2 - 10a^0b^0c^0d^0e^0f^0g^4h^7

So 

First term  = degree 9

Second term = degree 5

Third term = degree 8

Fourth term  = degree 11

So....degree 11

A polynomial cannot  fractional exponents associated with any variable.....so the second one  is out

Also....

(30y^2 ) / x  =   30y^2 x^-1....and a polynomial cannot have negative exponents associated wiith any variable

So....

The first and last answers are  correct...[ only non-negative  non-fractional exponents are allowed ]

Even though he  contributes  8%  of his salary to his 401k....the company only matches up to 6%...so....

29512  x  .06  =  $1770.72  ⇒  "B"

Ah...an income tax question....don't get many of these  !!!

Since Elaine makes $520 /wk....we want to look at the row   where Column A  = 500  and Column B  = 600

Because    520 > 500  but  520 < 600

Now....since she has 4 exemptions,  on this 500- 600 row,  go over to the column under "4"  and you will find   the number "2"

I assume that this means  $2  withheld per week  ⇒  "B"

Do you see how to do this, NSS  ???

Width  = 80 - 21  =  59 inches

Perimeter = 2  ( Width + Length )  =

2 ( 59 + 80)  =  2(139)   =  278 inches

Area  =  W x L   =  59 x 80   = 4720 in^2

First  one

x  =  180 - 64  - 58  = 58°

Acute ..Isosceles  

Second one :

We have an equilateral triangle  ...each  interior angle  = 60°   = x

Acute...Equiangular....Equilateral....Isosceles  [ some people will debate the "Isosceles" classification...."Isosceles"  is often defined as a triangle having EXACTLY two sides of equal length ]

Last one

x =  [180 - 48 ] / 2 = 132 / 2 =   66°

Acute...Isosceles

You are correct... 

B     ...  3x  = 15   so x  = 5

C   ......  x  = (12 - 8)  = 4  

You were right in both cases ...good job...!!!!