How do you solve: 1.10x-10+30=12x-42.15x+5+22x+4=1203 .40+9x-2=20x+5

Aregular hexagon rotates counterclockwise about its center. it turns through angles greater than 0° and less than or equal to 360°. at how many different angles will the hexagon map onto itself?

If x is 6, then 7x= a. 13 b. 42 c. 42x d. 76

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)