Find the value of x and 3x

Right angle =90°

The sum angle of triangle =180°

A turn =360°

(90-45)+(90-45)+a=180°

45+45+a=180°

90+a=180°

a=90°

a+3x=360°

90°+3x=360°

3x=270°

3x=270°

x=90°

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

a variable is any characteristics, number, or quantity that can be measured or counted. a variable may also be called a data item. hope i !