Find the simplified form of the expression. Give your answer in scientific notation. (8 x 10^4)(9 x 10^-8)
A. 7.2 x 10^-5
B. 7.2 x 10^-3
C. 72 x 10^-4
D. 7.2 x 10^-31

Find parametric equations for the line tangent to the curve of intersection of the surfaces at the given point. surfaces: xsquared2plus+2yplus+2zequals=1212 yequals=33 point: left parenthesis 1 comma 3 comma five halves right parenthesis

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

If set d is not the empty set but is a subset of set e, then which of the following is true? d ∩ e = d d ∩ e = e d ∩ e = ∅