Ashadow 15 yards long is cast by a fir tree that is 8 yards tall. if a lookout tower close by casts a shadow 45 yards long, how tall is the lookout tower?

What is the number 321,000,000 in scientific notation? also what is the number? ?

The means and mean absolute deviations of the individual times of members on two 4x400-meter relay track teams are shown in the table below. means and mean absolute deviations of individual times of members of 4x400-meter relay track teams team a team b mean 59.32 s 59.1 s mean absolute deviation 1.5 s 245 what percent of team b's mean absolute deviation is the difference in the means? 9% 15% 25% 65%

Anna is constructing a line segment that is congruent to another segment ab. for the construction, which tool should be used to mesure segment ab