Simplify 7(2.3 x 10 square root 11) and write in scientific notation

Which equation represents a proportional relationship that has a constant of proportionality equal to 1/5

The value √10 and √15 are plotted on the number line

Aschool had an election where the candidates received votes in the ratio 1: 2: 3. if the winning candidate received 210 votes, how many total people voted in the election?