Determine whether the equation is an identity or not an identity. cos theta/ sin theta tan theta = 1

a.

identity

b. not an identity

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

step-by-step explanation:

mean or average is 40.6

idk

step-by-step explanation: