Sandi tracks her calories burned during water aerobics class. the number of calories she burns is expressed by the function c(t) = 350t, where t is the number of hours spent doing water aerobics.

to burn more calories, sandi wears ankle weights during her class. the number of calories she burns while wearing ankle weights is expressed by the function b(c) = 1.2c, where c is the number of calories burned doing water aerobics without weights.

which of the following composite functions expresses the calories, as a function of time, sandi burns while doing water aerobics with ankle weights?

b[c(t)] = 351.2t
b[c(t)] = 420t
c[b(t)] = 351.2t
c[b(t)] = 420t

I've been working on this for a few days and i just don't understand, it's due in a few hours. you.the direction of a vector is defined as the angle of the vector in relation to a horizontal line. as a standard, this angle is measured counterclockwise from the positive x-axis. the direction or angle of v in the diagram is α.part a: how can you use trigonometric ratios to calculate the direction α of a general vector v = < x, y> similar to the diagram? part bsuppose that vector v lies in quadrant ii, quadrant iii, or quadrant iv. how can you use trigonometric ratios to calculate the direction (i.e., angle) of the vector in each of these quadrants with respect to the positive x-axis? the angle between the vector and the positive x-axis will be greater than 90 degrees in each case.part cnow try a numerical problem. what is the direction of the vector w = < -1, 6 > ?