Sarah and eva were swimming. use the ratio tables below to determine who the faster swimmer is.
time(min)- 3-5-12-17
distance(meters)- 75-125-300-425
time(min)- 2-7-10-20
distance(meters)- 52-182-260-520

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle