Sarah's pokemon weighs two hundred seventy-one thousandths of an ounce. Which expressions correctly represents the weight of his pokemon? Choose all the correct answers.

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,