If g(x) is an odd function, which function must be an even function

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

Write the sine and cosine values of a, b, respectively, in the figure for (1) and (2) + explanation.

Is triangle jkl congruent to triangle rst? if so, what is the scale factor?