From my understanding she now has -60 points.
Answer:
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<span>let number of hours of Isaac,Ruby and Svetlana worked be x,y and z respectively.
so y= x+6 ( equation 1)
note: Ruby (y) worked 6 hours more than Isaac (x)
z = 4 x y ( equation 2)
note : Svetlana (z) worked 4 times as many hours as Ruby (y)
x+y+z= 126 ( equation 3)
note: Together they (x,y,z) worked 126 hours.
substitute eqn 1 to eqn 3
so x+y+z= 126 becomes
y-6 + y+z-126
2y+z= 126+6
2y+z=132 (equation 4)
the substitute eqn 2 in eqn 4
so 2y+z=132 becomes
2y+4y=132
6y=132
y=132/6= 22
so y=22
substitute y value in equation 1
so y= x+6 becomes
x+6=22 and
x= 22-6 = 16
and substitute x and y values in equation 3
so 16+22+z= 126
38+z= 126
z= 126 -38 = 88
So the number of hours Isaac worked (x) is 16 hours
number of hours Ruby worked (y) is 22 hours
number of hours Svetlana worked (z) is 88 hours</span>
If the roots are r1,r2,r3, the facotred polynomail looksl ike this
f(x)=(x-r1)(x-r2)(x-r3)
given
roots 4,2i and -2i
f(x)=(x-4)(x-2i)(x-(-2i))
f(x)=(x-4)(x-2i)(x+2i)
expand
f(x)=x³-4x²+4x-16
3rd option