Which expression is equivalent to x + 2x + y + 2y?

A) 3x3y
B) 3x + 3y
C) 3 + xy
D) 6xy

There are 20 children in the cast of a class play and 8 of the children are boys of the boys 4 have a speaking part in the play and of the girls 8 do not have a speaking part in the play if a child from the cast of the place chosen at random what is the probability that the child has a speaking part

The trigonometric ratios sine and secant are reciprocals of each other

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?