. Tìm ñaïo haøm rieâng caáp hai 2
''
x
z
cuûa haøm hai bieán
3 2 sin y
z xe x y y x

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

sounds & other waves originate from any vibrating object

answer is c

step-by-step explanation:

81/12=324/x

x=48