Which of the following is a valid reason for using a given solution method to solve the system of equations shown
4x-5y=4
2x+3y=2

What is the logarithmic function modeled by the following table? x f(x) 9 2 27 3 81 4

Sanya noticed that the temperature was falling at a steady rate of 1.4 degrees every hour from the time that she first checked her outdoor thermometer. by 6 a.m., the temperature had fallen 21 degrees. which expression can you use to find how many hours earlier she had first checked the thermometer?

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ah=4 and hc=1, find bh.