Hooke's law states that f = -kx where f is the force by the spring, k is the spring constant, and x is the displacement (distance). write equation for the force by a spring with a spring constant of 30 n/m and an unknown displacement.

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c