at what points does the helix r(t) = sin(t), cos(t), t intersect the sphere x2 y2 z2 = 10? (round your answers to three decimal places. if an answer does not exist, enter dne.)

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Afarm that has 4 x 10^2 acres has 1.2 x 10^5 cattle. what is the average number of cattle per acre? write the answer in scientific notation. answere asap

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.