Let the width = x
the length = x+7
=> Area equation = length x width = x(x+7) = x^2 +7x = 78
=> x^2+7x -78 = 0
=> (x-6)(x+13)=0
=> x=6 or x=-13(no)
=> the width = 6 m
=> the length = 6+7= 13 m
Basically, to solve this problem, you have to solve or every single multiple choice.
a)3-7+(-10)=3-7-10=-14
b)3+7-(-10)=3+7+10=20
c)3-7-(-10)=3-7+10=6
d)3+7+(-10)=3+7-10=0
Thus B is the right choice because B is the biggest
A secant is simply a line that intersects the circle at exactly two points.
Therefore, line GH is a secant of circle
B since it intersects the circle ast 2 points.
