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You didn't provide the table, but I expect the Unionid mussel numbers decreased as the invasive zebra mussels increased.  Zebra mussels are taking space and nutrients and algae that the Unionids need to flourish.   I think Zebra mussels even attach to unionids which kills them.

Please help

Thanks for checking :/ ~Hannah

Told ya~Hannah

Slope of given line  is m = -2/5     perpindicular is  - 1/m = 5/2

Point slope form of the new line through -7, 2    is      y-2   = 5/2 ( x - -7)

                                                                                   y = 5/2 x + 35/2 +2

                                                                                    y = 5/2 x + 39/2

Here is a graph ( which I used as a check):

https://www.desmos.com/calculator/kvm5df9b2n

The slope of our line y = x/4 + 5 is m = 1/4

Since we're coming up with the equation of a line that is perpendicular, the slope of our perpendicular line is the opposite reciprocal of 1/4, or m = - 4/1 or m = 4

Now, we need to find out the y-intercept of our perpendicular line. To do that we plug in (2, 7) into x and y as well as - 4 into m in the following equation:

y = mx + b

7 = (- 4)(2) + b

7 = - 8 + b

15 = b

Thus, with m = - 4 and b = 15, the equation of our perpendicular line is:

y = - 4x + 15

WARNING: Possibly wrong~ Hannah

I know the answer is wrong 

But so is depression~Hannah

Sum of the faces    1 + 2 + 3......+ 12 = 78

78/12 = 6.5

Feel*

Ima leave you alone & stop bothering you~Hannah

Given   L = 1/5 A

then   Adam gives 22

L + 22 = A - 22        sub in the red equation

1/5 A + 22 = A - 22

A = 55        L = 1/5 A = 11       Total = 66 shells

t^2 - 9t - 36 + 7t - 20

t^2 -2t - 56 = 0                Is a bowl shaped parabola ...the minimum value will occur at  t = - b/2a =   - -2/2 =1

                                       (  If needed:   use this value fo t in the equation to compute the minimum value of the fxn)

The other  3 out of 5 are right handed    3/5 ths of 50 =   3/5 * 50 = 30 ppl   

30 - 20 = 10 ppl more are rt handed then left handed

One large rectangle with sides 9  ( don't count the '3' where the triangles are attached)  and 7     =  18 + 14

TWo triangles  with legs  8    and hypotenuse  5     = 26         26 + 18 + 14 =

BC = 79/2.

What real value of t produces the smallest value of the quadratic t^2 - 9t - 36 + 7t - 20?

That answer is wrong.

X = (y+1)/(y+2)   to get the inverse, switch x's and y 's then solve for x

y = (x+1)/(x+2)

(x+2)y =  x+1

xy + 2y -x = 1

x ( y-1) = 1 - 2y

x = (1-2y)/(y-1)       is the inverse       h-1 (5) = -9/4  =  - 2 1/4

9 sides have 1 digit (1, 2, 3, ..., 9) and 3 sides have 2 digits (10, 11, 12)

Total number of digits:  1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 2 + 2 + 2  =  15

Divide this value by the number of sides:

15 /12  =  1.25

Hope this helped~Hannah

1/2 doz   + 4   =

1.26       + 4 * .25   = $ 2.26

1 DOZ = $ 2.41          $    2.41 - 2.26 = 15 CENTS LESS TO BUY  1/2 DOZ + 4 COOKIES

60 yd  * .92 /yd      -        60 yd  * .52/yd =  $24 more for the very high priced  3/4 in masking tape (60 yds each)

  1/2 bushel      + basket     +      ribbon               

23.50 *  1/2      + 8.59        +    2.5 * .88     = total spent   = $ 22.54

Uhmmm... I...I'm only 14