Over the interval [0, 2π), what are the solutions to cos(2x) = cos(x)? Check all that apply.

In triangle opq right angled at p op=7cm, oq-pq=1 determine the values of sinq and cosq

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

This is a map of the mars exploration rover opportunity predicted landing site on mars. the scale is 1cm : 9.4km. what are the approximate measures of the actual length and width of the ellipse? i mostly need to know how to set it up : )