C(n) = -7 + 6(n - 1)c(n)=−7+6(n−1)c, left parenthesis, n, right parenthesis, equals, minus, 7, plus, 6, left parenthesis, n, minus, 1, right parenthesis Find the 4^\text{th}4 th 4, start superscript, start text, t, h, end text, end superscript term in the sequence.

area of part 1:

a1=base*height/2=(8+2)*(8-2-2-1)/2=10*3/2=15 ft^2

area of part 2:

a2=length*width=(8+2)*1=10 ft2

area of part 3:

a3=length*width=8*2=16 ft2

total shaded area : a1+a2+a3=41 ft2

total area of the reactangle : a=16*8=128 ft2

total area of the nonshaded region : 128-41=87 ft2

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step-by-step explanation:

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according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: