Can I get some help on this

Aconvex octagon has interior angles that measures 73 degrees, 172 degrees, 132 degrees, 59 degrees, 154 degrees, 163 degrees, x degrees, 2x degrees find the value of the missing angles

If 1 is divided by the sum of y& 4.the result is equal to 3 divided by 4, find the value of m

Gabrielle's age is two times mikhail's age. the sum of their ages is 84. what is mikhail's age?