CPhill

−4x^2(2x^2+5)=−8x^4−20x^2

And

−5a^4(2a^2+4)=−10a^6−20a^4

Are correct

Note that the points  ( 0, -4)   and (8,0) are on the graph

Slope  =   [ 0 - -4 ] / [ 8 - 0 ]   =  [ 4] / [8]   =  1/2 ⇒  C

We have  the  points  (0, 300)  and (4,0)

Slope  = rate of change  =     [ 0- 300 ] / [ 4 - 0 ]   =  -300 / 4  =  -75  ....the value drops $75 / yr ⇒  A

Rate  of change   =  Slope

Let the first two "points"  be  (2, 9)  and  (5, 22.5 )

Slope =    [  22.5 - 9  ]  / [ 5 - 2  ]  =  [ 13.5] / [3] =    4.50   per person ⇒ A

Slope   =  subtract the  y  coordinates in  some order   /  subtract the x coordinates in the same order  =

[ 8 - 4  ] / [ 0 - 2 ] =    4  / -2     = -2

(a^2 + 3a - 7)  ( 2a^2 - a + 4)

Distribute  each term in the first set of parentheses over all the terms in the second and we have

a^2 * 2a^2  + a^2* - a + a^2* 4  =     2a^4   - a^3    + 4a^2

3a * 2a^2  + 3a * -a  + 3a * 4  =                   +6a^3  - 3a^2   + 12a

-7 *2a^2   - 7 * -a   - 7 * 4   =                                  -14a^2   + 7a     - 28

Add  the columns and we  get

 2a^4  + 5a^3  - 13a^2  + 19a  - 28

 289 * 4  weeks in a month  =  $1156   ?????

I don't know, NSS.....none are correct  [ or even close ] to what I calculated

40 hrs  * regular pay/hr  +  7 overtime hours * regular pay/ hr  * 1.5  = 

40 * 6.10    +   7 * 6.10 * 1.5    = $308.05  ⇒  C

66410 * .08   * 50%    =  $2656.40  ⇒  B