Wite the equation for this podem in the formy=
cos
+
The figure shows the depth of water at the end of about dock. The depth is 2
fost at low side and 6 feet at high ide On a certain day, low secours at 6 AM
and high seat noon y represents the depth of the water x hours after
midnight use a cosine function of the formy-Acos BxDto model the waters
depth
y=
Type an erpression using as the vale Type a erada
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of the the
Enter your answer in the answer box and then ack Check Answer
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there are lots of ways.   pick's theorem tells us if the vertices are lattice points the area a is

a = b/2 + i - 1

where b is the number of boundary lattice points and i is the number of interior lattice points.

in the figure i count b=16, i=50 so

a = 8 + 50 - 1 = 57

let's try the shoelace formula.   the area is half the sum of the cross products of the sides.  

a(-2,6)   -2(2)-6(-5) = 26

b(-5,2)   -5(-3) - 2(-2) = 19

c(-2,-3) -2(-3) - (-3)(4) = 18

d(4,-3)   4(3) - (-3)(5) = 27

e(5,3)   5(3) - 3(1) = 12

f(1,3)     1(6) - 3(-2) = 12

a(-2,6)

each of the cross products is twice the area of the triangle with the associated side and one vertex the origin. so the area of abo=26/2=13.

area = (1/2) (26 + 19 +   18 + 27 + 12 + 12) = 57

that checks!

isi

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use that smart brain

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