Help PL ASAP Assume that Q, R, and S are the angles of a triangle, with opposite sides q, r, and s respectively. Select all of the following that represent the law of cosines.

A.) q2 = r2 + s2 – 2rscos(Q)
B.) q2 = r2 + s2 – 2qscos(R)
C.) r2 = q2 + s2 – 2qscos(Q)
D.) r2 = q2 + s2 – 2qscos(R)
E.) s2 = q2 + r2 – 2qrcos(S)

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

Ascientist has 50 grams of a radioactive element. the amount of radioactive element remaining after t days can be determined using the equation (1) after two days the scientist receives a second shipment of 50 grams of the same element. the equation used to represent the amount of shipment 2 remaining after t days is 10) - 50 which of the following is an equivalent form of the expression for the amount remaining in shipment 2? what’s the answer?

What is the arc length of the subtending arc for an angle of 72 degrees on a circle of radius 4? o a. 8a oc. 16 t d. 8