Help please and explain this for me please thanks

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  (d)  D: [0, 60]; R: [-15, 0]

Step-by-step explanation:

The model is of the underwater portion of the net, so the only part of the graph we're interested in is that below the x-axis.

The x-intercepts of 0 and 60 define the bounds of the domain.

The range is the vertical extent of the graph in that domain, from y=-15 to y=0.

So, the domain and range are ...

  Domain: 0 ≤ x ≤ 60

  Range: -15 ≤ y ≤ 0

3. parallelogram

step-by-step explanation:

we turn each of our sides into direction vectors

ab=b-a=(3 - 7, 1 - 0) = (-4, 1)

bc=c-b=(1,6)

cd=d-c=(4,-1)

da=a-d=(-1,-6)

we see how the opposite sides have negated direction vectors; this is characteristic of a parallelogram.   we have congruent sides ab=cd and bc=da with unequal lengths because 1^2+6^2 is different from (-4)^2+1^2.   so it's not a square or a rhombus.  

we check the dot product of direction vectors of adjacent sides.   we have

ab dot bc = -4(1) + 1(6) = 2

that's not zero so the sides are not perpendicular.   we've ruled out rectangle.

the direction vectors indicate two pairs of congruent parallel sides, so we choose parallelogram over trapezoid.

sorry, i don't know i just need points, i'm new here. chao