A ship sails north for 2 hours, traveling a total of 15 miles. Then the ship turns south and travels 6 miles in an hour. If north is taken as the positive direction, what is the velocity of the ship?

7 miles per hour , 7 miles per hour , ,

–3 miles per hour , –3 miles per hour , ,

3 miles per hour , 3 miles per hour , ,

–7 miles per hour

please help!!!

Answer asap ill give ! ’ a sample of radioactive material decays over time. the number of grams, y , of the material remaining x days after the sample is discovered is given by the equation y = 10(0.5)^x. what does the number 10 represents in the equation? a. the half-life of the radioactive material, in days b. the amount of the sample, in grams, that decays each day c. the time, in days, it will take for the samples to decay completely d. the size of the sample, in grams, at the time the material was discovered

Write an equation of the line that passes through the point (2, 3) and is perpendicular to the line x = -1. a) y = 1 b) y = 3 c) y = 0 eliminate d) y = -3

What is the domain of the step function f(x)=[2x]-1?