According to hooke's law, the force required to compress or stretch a spring from an equilibrium position is given by f(x)=kx, for some constant k. the value of k (measured in force units per unit length) depends on the physical characteristics of the spring. the constant k is called the spring constant and is always positive.

center= (-2,0)

radius= sqrt2/2

step-by-step explanation:

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

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d. $180

step-by-step explanation:

if the dimensions of the room is 9ft by 12 ft, we have the area of the floor as,

so the area of the floor is 108 square feet, converting that into square yards we get,

the cost of carpet is $15 per square yard, therefore the cost of carpet for 12 square yards is,

hence, the cost of carpet is $180.

assuming the dimensions of the room be,

15 ft by 12 ft

so, the area of the floor of that room is,

we can convert 180 square feet into square yards, we know that,

1 sq ft = 0.111 sq yard

so, 180 square feet is,

so the area of floor is 20 square yards.

now, the cost of carpet is 15 dollars per square yard, therefore the cost of carpet for 20 square yards is,

so, it will cost $300.

3

step-by-step explanation:

because where the point where the 2 lines intersect is (3,-1) the x value is 3