(2.5×10−8)(9×10−10)

express your answer in scientific notation.

2.25×10−19

2.25×10−16

2.25×10−17

2.25×10−18

If 90° < θ < 180° and cotθ = -1/3, then cscθ =

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^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?