Which graph below has an Euler Circuit ?

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

Given right triangle abc, what is the value of tan(a)?

At the beginning of the year, adrian's savings account balance was \$28$28. each week, he deposits another \$15$15 into that account, and he doesn't spend any of his savings. is his savings account balance proportional to the number of weeks since the start of the year?