What is the value of (2/4)^-4?

Aboat has a speed of 9 mph in calm water. it takes the boat 4 hours to travel upstream but only 2 hours to travel the same distance downstream. which equation can be used to find c, the speed of the current? 2(9 – c) = 4(9 + c) 9 + c = 4(9 – c) 9 – c = 2(9 + c) 4(9 – c) = 2(9 + c)

Points a and b are to be mapped onto a number line according to two equations the solution to the equation 2/3 a equals -24 is the coordinate of point a. solution to the equation 20 equals negative b / 0.2 is the coordinate of point b. (a)solve the first equation to find the coordinate of point a show your work (b)be solved the second equation to find the coordinate of point b show your work (c)determine the distance between the points a and b explained

The correlation between height and weight for a certain breed of plant is found to be 0.75. what percentage of the variability in plant weight is not explained by height? 1-0.75 = 0.25 or 25% (b) )^2 = 0.5625 or 56.25% (c) )^2 = 0.4375 or 43.75% (d) (1 - 0.75)^2 = 0.0625 or 6.25%