The table gives 20 years of data on the number of students in a particular school who participate in the statewide debate competition. A sample is taken to include only the last 3 years of this data. With this information, calculate both the population mean and the sample mean for debate
competition participants per year.
OA. The population mean is 5.33. The sample mean is 4.21.
OB. The population mean is 4.35. The sample mean is 5.33.
Oc The population mean is 5.33. The sample mean is 3.75.
OD. The population mean is 4.21. The sample mean is 5.33.
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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.

your answer   is c

step-by-step explanation:

the ratios are reciprocals im positive

step-by-step explanation:

they are all positive numbers so it wouldn't be the other ones

since no one answered yet i will give it a shot, not completely sure tho.

i think it should be y=cos(x+2pi), (third answer, answer c)

good luck.